Home » Diseases » In cats » Chlamydiosis (Bacterial Infection of the Upper Respiratory Tract with Chlamydia Species)

Chlamydiosis (Bacterial Infection of the Upper Respiratory Tract with Chlamydia Species) in cats

Occurrence: common
Location of illness: Chest, General/Whole body

Author: Dr. med. vet. Gisa Löwe | Last modified: 17.02.2026

When to visit the vet?

Non-urgent see a veterinarian within 2–3 days

If the condition worsens / symptoms persist, consult a veterinarian.

Definition

Chlamydiosis in cats is a bacterial infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. of the upper respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs. caused by the bacterium Chlamydia felis, primarily affecting the eyes and respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs..

The most important facts at a glance

Chlamydiosis is an infectiousInfectious describes the ability of a pathogen to be transmitted from one individual to another and trigger an infection. It also refers to diseases caused by such pathogens. disease in cats caused by the bacterium Chlamydia felis. These bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. live inside the cells of their host and are transmitted primarily through direct contact with infected animals or contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. objects. Especially in densely populated environments such as animal shelters, the risk of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. is high. The disease leads to inflammation of the mucous membranes in the eyes and respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs., with conjunctivitis being a common symptom. Other symptoms include sneezing, increased tearing, cough, and loss of appetite. For diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients., clinical symptoms are used in combination with tests such as PCR to detect the presence of Chlamydia felis. Treatment is primarily with antibiotics such as doxycycline, and therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. should be fully completed to prevent relapses. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is good if the infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. is detected and treated early. Good hygiene, quarantineQuarantine is the isolation of animals to prevent the spread of disease. This may be necessary if an infectious disease is suspected or after animals are imported from other countries. of new cats, and vaccinations contribute to preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring.. Research focuses on developing new vaccines and alternative treatment methods to combat antibiotic resistanceResistance refers to the ability of microorganisms to withstand the effects of antibiotics, antifungals, or other antimicrobial drugs. Resistance can also refer to the body's ability to be insensitive to diseases or toxins.. Environmental factors such as stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. and diet are also being studied, as they can influence susceptibility to infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease.. Early detection and comprehensive preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. strategies are important to control the spread of the disease.

Causes

Chlamydiosis is an infectious disease caused by the bacterium Chlamydia felis. These bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. are gram-negative, intracellular pathogens, meaning they live and multiply inside the cells of their host. Chlamydia felis belongs to the family Chlamydiaceae, which is responsible for a variety of infections in humans and animals.

Transmission of chlamydia occurs primarily through direct contact with infected animals or through contact with contaminatedContaminated describes something that has been polluted by harmful microorganisms, chemicals, or other dangerous substances. In veterinary medicine, this can affect food, water, toys, or the environment. objects such as food bowls or toys. In densely populated environments such as animal shelters or multi-cat households, the risk of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. is particularly high. The bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. can also be spread via droplet infectionDroplet infection refers to the transmission of pathogens through small droplets of liquid that are released into the air when infected people Cough, Sneeze, or talk and are inhaled by other people., especially when an infected cat sneezes.

InfectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. with Chlamydia felis leads to inflammation of the mucous membranes in the cat’s eyes and respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs.. These inflammatory conditions are the primary features of the disease and can become chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. without treatment. The pathogens have a preference for the conjunctiva of the eyes, leading to conjunctivitis, which is one of the most common symptoms.

Symptoms

Very common symptoms:

Common symptoms:

Cats suffering from chlamydiosis often show symptoms associated with upper respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs. infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease.. The most common symptoms include conjunctivitis, characterized by red, swollen eyes and eye discharge. The discharge can range from watery to purulentPurulent refers to pus or the production of pus, which may indicate a bacterial infection. Purulent inflammatory conditions are often painful and may have significant swelling and redness. and typically occurs in both eyes.

In addition to conjunctivitis, infected cats may show sneezing, nasalNasal refers to the nose and nasal cavities. In veterinary medicine, this can involve examinations, treatments, or diseases affecting the nose of dogs and cats. discharge, and respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress. These symptoms resemble those of other respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. diseases, which can complicate diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. In some cases, fever, loss of appetite, and lethargy may also occur. In young animals and cats with weakened immune systems, symptoms may be more severe.

It is important to note that some cats can be carriers of the bacterium without showing symptoms. However, these asymptomaticAsymptomatic means that there are no recognizable symptoms of a disease. An animal can have a disease or infection without showing visible signs, which can make diagnosis and treatment more difficult. carriers can infect other cats and contribute to the spread of the disease.

Diagnosis

DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of chlamydiosis in cats is based on a combination of clinical symptoms and specific diagnostic tests. Since the symptoms resemble those of other respiratory diseases, accurate diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is often necessary to initiate appropriate treatment.

A veterinarian can take a conjunctival sample to detect the presence of Chlamydia felis using PCR (polymerase chain reaction)The polymerase chain reaction is a molecular biology technique used to replicate and analyze specific DNA sequences. In veterinary medicine, PCR is used for diagnostic purposes, including the identification of pathogens. or by culturing the bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease.. PCR is a sensitive method that detects genetic material of the pathogenA pathogen is a microorganism or virus that can cause disease in its host. Pathogens include bacteria, viruses, fungi, and parasites. and enables rapid and accurate diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. In some cases, an antibodyAn antibody is a protein produced by the immune system to recognize and bind specific antigens. By binding to the antigen, antibodies can help destroy or neutralize it. test may be performed to detect previous exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to the pathogenA pathogen is a microorganism or virus that can cause disease in its host. Pathogens include bacteria, viruses, fungi, and parasites..

Since other pathogens such as viruses and bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. can cause similar symptoms, it is important to rule out other infections. The veterinarian may order additional tests to ensure there is no mixed infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease..

Therapy

Treatment of chlamydiosis in cats primarily involves administering antibiotics to kill the bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. and relieve symptoms. Doxycycline is the most commonly used antibiotic for treating this infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease., as it is effective against intracellular bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. such as Chlamydia felis. Treatment typically lasts two to six weeks, depending on the severity of the infection and response to therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions..

In addition to antibiotic therapy, supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures such as cleaning the eyes with saline solution and applying eye drops can help relieve symptoms. It is important to complete the full course of treatment to prevent relapse and ensure the bacteriaBacteria are microscopic, single-celled organisms that exist in almost every environment on Earth. Some types of bacteria are beneficial or even essential to life, while others can cause disease. are completely eliminated.

In cases where the infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. is severe or the cat’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. is weakened, more intensive medical care may be required. The veterinarian may recommend additional treatments to support the cat’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. and prevent complications.

Prognosis and follow-up care

The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. for cats with chlamydiosis is generally good if the infection is detected early and treated appropriately. Most cats respond well to antibiotic therapy and recover completely. Timely treatment can reduce the risk of complications and chronicChronic refers to a condition or disease that is long-lasting or permanent. Chronic diseases often develop slowly and can lead to persistent or recurring health problems over time. infections.

In some cases, however, relapses may occur, especially if treatment is not fully completed. Cats in environments with high infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. pressure, such as animal shelters or multi-cat households, are more susceptible to reinfectionReinfection refers to the recurrence of an infection in an individual who was previously cured of the same disease. This can be caused by the same or a similar pathogen. or mixed infectionsMixed infections occur when two or more pathogenic microorganisms simultaneously cause an infection in the body. They can complicate the diagnosis and treatment of Diseases in Dogs and cats. with other pathogens.

In cats with weakened immune systems or other health problems, recovery may take longer, and the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. may vary depending on individual circumstances. Close monitoring by the veterinarian and regular follow-up examinations are important to ensure the cat’s health.

Prevention

PreventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of chlamydiosis in cats begins with good hygiene. Regular cleaning of the environment, especially food and water bowls as well as litter boxes, can reduce the risk of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. spreading. Cat owners should ensure their animals have no contact with infected cats, especially in multi-cat households or animal shelters. QuarantineQuarantine is the isolation of animals to prevent the spread of disease. This may be necessary if an infectious disease is suspected or after animals are imported from other countries. of new cats can help protect existing animals from possible transmission.

Another effective preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measure is vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases.. There are vaccines against chlamydiosis that can be part of a comprehensive vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases. program. These vaccines help reduce the risk of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. but are not 100% effective. Therefore, they should be considered as part of a more comprehensive strategy.

Additionally, it is important for cat owners to have their animals examined regularly by a veterinarian. Early detection of symptoms can help prevent the spread of the disease. Finally, cats should be kept in stress-free environments, as stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. can weaken the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. and increase susceptibility to infections. A balanced diet and adequate exercise also contribute to strengthening the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body..

Outlook on current research

Current research on chlamydiosis in cats focuses on several key areas to deepen understanding of this disease and develop more effective treatment and prevention strategies. A significant portion of current research is devoted to developing new vaccines. While there are already some vaccines designed to protect against Chlamydia felis, the pathogenA pathogen is a microorganism or virus that can cause disease in its host. Pathogens include bacteria, viruses, fungi, and parasites. causing chlamydiosis in cats, intensive work is underway to improve the efficacy and safety of these vaccines. Researchers are also investigating the genetic variability of C. felis to better understand how this pathogenA pathogen is a microorganism or virus that can cause disease in its host. Pathogens include bacteria, viruses, fungi, and parasites. adapts to its host populationIn veterinary medicine, the term population refers to a group of animals of a particular species living in a specific geographic area or environment. and how this might influence vaccineA vaccine is a substance that stimulates the immune system to develop immunity against specific pathogens without causing the disease itself. Vaccines may contain weakened or inactivated pathogens, toxoids, or recombinant antigens. development.

Another focus of research is on investigating the pathogenesisPathogenesis describes the process of the origin and development of a disease, including the mechanisms that lead to the disease's symptoms and signs. of the disease. Scientists are trying to decipher exactly how C. felis infects the upper respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs. and what specific immune responses are triggered in the cat. These insights are crucial for developing therapeutic approaches that can specifically interrupt the mechanisms of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease.. The role of the cat’s microbiome is also being considered, which may play an important role in susceptibility to chlamydiosis.

Additionally, the development of resistanceResistance refers to the ability of microorganisms to withstand the effects of antibiotics, antifungals, or other antimicrobial drugs. Resistance can also refer to the body's ability to be insensitive to diseases or toxins. to antibiotics used to treat chlamydiosis is being intensively studied. As antibiotic resistanceResistance refers to the ability of microorganisms to withstand the effects of antibiotics, antifungals, or other antimicrobial drugs. Resistance can also refer to the body's ability to be insensitive to diseases or toxins. increases worldwide, it is crucial to develop alternative treatment strategies. Current studies are examining the use of probiotics and other natural agents that may help contain the infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. without contributing to further resistanceResistance refers to the ability of microorganisms to withstand the effects of antibiotics, antifungals, or other antimicrobial drugs. Resistance can also refer to the body's ability to be insensitive to diseases or toxins. development.

Finally, research is also investigating the influence of environmental factors on the spread and occurrence of chlamydiosis in cats. Factors such as stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being., diet, and living conditions of cats may play a role in how susceptible a cat is to infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. and how severe the symptoms are. By better understanding these factors, researchers hope to develop more targeted preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. measures that go beyond vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases. alone.

In summary, current research on chlamydiosis in cats shows a dynamic field addressing numerous aspects of this disease. The results could not only lead to better treatment methods but also help improve the overall health and well-being of cats worldwide.

Frequently asked questions (FAQs)

What is chlamydiosis in cats? Chlamydiosis is a bacterial infection caused by the bacterium Chlamydia felis. It primarily affects the upper respiratory tractThe respiratory tract includes the organs and structures involved in the breathing process, including the nose, pharynx, larynx, trachea, bronchi, and lungs. of cats and can cause symptoms such as sneezing, nasalNasal refers to the nose and nasal cavities. In veterinary medicine, this can involve examinations, treatments, or diseases affecting the nose of dogs and cats. discharge, and conjunctivitis.
How is chlamydiosis transmitted in cats? The disease is usually transmitted through direct contact with infected cats. This can occur through droplet infectionDroplet infection refers to the transmission of pathogens through small droplets of liquid that are released into the air when infected people Cough, Sneeze, or talk and are inhaled by other people. when sneezing, through shared use of food bowls, or through mutual grooming.
Can humans be infected with chlamydiosis from cats? It is very rare for humans to become infected with chlamydiosis from cats. Transmission of C. felis to humans is extremely unlikely and rarely documented.
What symptoms do cats with chlamydiosis show? The most common symptoms include sneezing, nasalNasal refers to the nose and nasal cavities. In veterinary medicine, this can involve examinations, treatments, or diseases affecting the nose of dogs and cats. discharge, red and swollen eyes (conjunctivitis), and occasionally fever. In some cases, respiratoryRespiratory refers to breathing or the process of breathing. Respiratory diseases affect the respiratory tract and can impair the ability to breathe effectively. distress may also occur.
How is chlamydiosis diagnosed in cats? DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. is usually made through a combination of clinical examination and laboratory tests. A veterinarian can take swabs from the eyes or nose and test for the presence of C. felis.
How is chlamydiosis treated in cats? Treatment usually consists of administering antibiotics that are specifically effective against C. felis. It is important to complete the full course of antibiotics to completely eliminate the infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease..
Is there a vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases. against Chlamydiosis in cats? Yes, there are vaccines specifically developed against chlamydiosis in cats. These vaccinations can reduce the risk of infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. but do not provide complete protectionProtection refers to safeguarding against diseases or harm. In veterinary medicine, this can include protecting animals through vaccinations, the use of parasite control products, or providing a safe environment..
How can I prevent my cat from getting chlamydiosis? In addition to vaccinationVaccination is the process of administering a vaccine to develop immunity against a specific infectious disease. It is one of the most effective methods of prevention of infectious diseases., it is important to maintain good hygiene, especially for cats in close contact with other cats. Regular veterinary visits can help monitor your cat’s health.
Is chlamydiosis curable in cats? Yes, chlamydiosis is curable in most cases with proper treatment. It is important to start treatment early and follow the veterinarian’s instructions precisely.
Can other animals be infected by a cat with chlamydiosis? Other cats can easily become infected, especially if they have close contact. It is therefore advisable to isolate infected cats from other animals until treatment is completed.

Frequently asked questions (FAQs)

1. What is chlamydiosis in cats?

Chlamydiosis is a bacterial infection caused by the bacterium Chlamydia felis. It primarily affects the upper respiratory tract of cats and can cause symptoms such as sneezing, nasal discharge, and conjunctivitis.

2. How is chlamydiosis transmitted in cats?

The disease is usually transmitted through direct contact with infected cats. This can occur through droplet infection when sneezing, through shared use of food bowls, or through mutual grooming.

3. Can humans be infected with chlamydiosis from cats?

It is very rare for humans to become infected with chlamydiosis from cats. Transmission of C. felis to humans is extremely unlikely and rarely documented.

4. What symptoms do cats with chlamydiosis show?

The most common symptoms include sneezing, nasal discharge, red and swollen eyes (conjunctivitis), and occasionally fever. In some cases, respiratory distress may also occur.

5. How is chlamydiosis diagnosed in cats?

Diagnosis is usually made through a combination of clinical examination and laboratory tests. A veterinarian can take swabs from the eyes or nose and test for the presence of C. felis.

6. How is chlamydiosis treated in cats?

Treatment usually consists of administering antibiotics that are specifically effective against C. felis. It is important to complete the full course of antibiotics to completely eliminate the infection.

7. Is there a vaccination against Chlamydiosis in cats?

Yes, there are vaccines specifically developed against chlamydiosis in cats. These vaccinations can reduce the risk of infection but do not provide complete protection.

8. How can I prevent my cat from getting chlamydiosis?

In addition to vaccination, it is important to maintain good hygiene, especially for cats in close contact with other cats. Regular veterinary visits can help monitor your cat's health.

9. Is chlamydiosis curable in cats?

Yes, chlamydiosis is curable in most cases with proper treatment. It is important to start treatment early and follow the veterinarian's instructions precisely.

10. Can other animals be infected by a cat with chlamydiosis?

Other cats can easily become infected, especially if they have close contact. It is therefore advisable to isolate infected cats from other animals until treatment is completed.