Upper Respiratory Infection in Cats: Causes and Treatments

Understanding Upper Respiratory Infections in Cats

Upper respiratory infections (URIs) are among the most common health issues affecting cats, particularly in multi-cat households, shelters, and catteries. These infections affect the nasal passages, throat, and upper respiratory tract, causing symptoms similar to the common cold in humans. Understanding what causes these infections, how to recognize them, and the available treatment options is essential for every cat owner who wants to maintain their feline companion’s health and well-being.

Feline upper respiratory infections, commonly referred to as “cat flu,” are highly contagious conditions that affect approximately 90% of cases through specific viral pathogens. While most cats recover naturally within one to two weeks with proper supportive care, some cases can develop into more serious complications if left untreated. Early recognition and appropriate management can significantly reduce your cat’s suffering and prevent the spread of infection to other cats in your household.

What Causes Upper Respiratory Infections in Cats

Upper respiratory infections in cats are primarily caused by viral agents, with two main culprits responsible for the majority of cases:

Feline Herpesvirus (FVR)

Feline herpesvirus is one of the most common causes of upper respiratory infections in cats. Once a cat contracts herpesvirus, the virus remains dormant in nerve tissue and can be reactivated during times of stress, illness, or immune suppression. This means that infected cats may experience recurrent symptoms throughout their lives, though the infection typically goes into remission rather than being completely cured.

Feline Calicivirus (FCV)

Feline calicivirus is another major viral cause of feline upper respiratory infections. Like herpesvirus, calicivirus can persist in infected cats and may cause chronic symptoms. Some strains of calicivirus can be particularly severe, potentially causing systemic disease and serious complications.

Bacterial Infections

While viral infections account for the majority of URIs, bacterial infections can also occur as primary infections or as secondary infections following a viral illness. Common bacterial agents include Bordetella and Chlamydophila species. Cats may develop secondary bacterial infections when their immune system is already compromised by a viral infection.

Recognizing the Symptoms of Cat Upper Respiratory Infection

The symptoms of upper respiratory infections in cats can vary in severity from mild to severe. Cat owners should be familiar with both common and less obvious signs that indicate their cat may have a URI:

Common Symptoms

The typical signs of upper respiratory infection in cats include:

• Sneezing and nasal congestion
• Nasal discharge or crusting around the nose
• Watery or goopy eye drainage
• Conjunctivitis (redness or swelling of eye membranes)
• Squinting or eye discomfort
• Coughing
• Decreased or absent appetite
• Lethargy and reduced activity levels
• Fever

Severe Symptoms Requiring Immediate Care

Some cats develop more serious symptoms that warrant immediate veterinary attention. If your cat exhibits any of the following signs, contact your veterinarian right away:

• Difficulty breathing or open-mouth breathing
• Green or yellow discharge from the eyes or nose
• Persistent high fever
• Complete loss of appetite for more than a few days
• Severe lethargy or depression
• Mouth ulcers or excessive drooling
• Enlarged lymph nodes

Treatment Options for Feline Upper Respiratory Infections

The treatment approach for upper respiratory infections depends on the severity of the infection, the underlying cause (viral or bacterial), and your individual cat’s health status. Most cats with mild to moderate URIs can be successfully managed at home, while severe cases may require hospitalization and intensive care.

Supportive Care at Home

For mild viral infections, supportive care is often sufficient to help your cat recover naturally. This approach focuses on keeping your cat comfortable while their immune system fights off the infection.

Maintaining Proper Hydration: Ensure your cat has constant access to fresh water. Water additives like Purina Hydra Care can help increase water intake and keep your cat hydrated while their immune system is compromised. If your cat refuses to drink, encourage them by providing water in different locations or using a cat water fountain, which many cats find more appealing.

Nutritional Support: Since cats with respiratory infections often have a decreased sense of smell due to nasal congestion, they may have reduced appetite. Offer highly palatable canned foods with strong aromas, such as Fancy Feast Gravy Lovers or foods with broth toppers like Rachel Ray Nutrish Purrfect Broths. Warm the food slightly to enhance its aroma and make it more appealing.

Environmental Management

Humidity Therapy: Keep your cat in a humid environment to help open nasal passages and ease congestion. You can use a humidifier near your cat’s resting area, or take your cat into the bathroom with you while you shower to expose them to warm steam. This simple therapy can be repeated several times daily for 10-15 minutes at a time.

Saline Nasal Drops: Infant saline nose drops can be used to moisten your cat’s airways if they will tolerate it. This can help relieve congestion and make breathing more comfortable.

Medication-Based Treatment

Eye Medications: If your cat has eye discharge, your veterinarian may prescribe topical eye medications such as tobramycin drops or Terramycin ointment to prevent secondary eye infections and reduce inflammation.

Antibiotics: Antibiotics are prescribed when bacterial infections are suspected or confirmed. Common antibiotics for cats include Clavamox and azithromycin. It is crucial to administer antibiotics exactly as prescribed and complete the full course of treatment, even if your cat appears to improve, to prevent antibiotic resistance and ensure complete elimination of the bacterial infection.

Anti-inflammatory Medications: If your cat has a fever or is in pain, your veterinarian may prescribe anti-inflammatory medications such as Onsior to provide relief and improve comfort levels.

Antiviral Agents: For severe herpesvirus infections, antiviral medications like famciclovir may be prescribed to interfere with viral replication and reduce the severity of symptoms.

Immune Support Supplements

Several supplements can help support your cat’s immune system while recovering from a URI:

• Probiotic powder such as Purina FortiFlora to support gut health and immune function
• L-Lysine supplements like Viralys or Vetri Lysine Plus, which may help reduce herpesvirus shedding and severity
• Additional probiotics such as Proviable

Hospitalization for Severe Cases

Severe upper respiratory infections may require hospitalization and intensive care. In these cases, your veterinarian may provide:

• Oxygen therapy to assist breathing
• Nebulization treatments to deliver medication directly to the respiratory tract
• Injectable antibiotics for systemic treatment
• Intravenous fluid therapy for hydration and nutritional support
• Feeding tubes if the cat is unable or unwilling to eat

Recovery Timeline and Monitoring

The recovery timeline for cats with upper respiratory infections varies depending on the severity and underlying cause. Typically, cats with uncomplicated viral infections recover within 5-10 days to two weeks. During the recovery period, it is important to monitor your cat closely and watch for signs of improvement or deterioration.

Monitor whether your cat is eating regularly, maintaining normal energy levels, and showing signs of gradual improvement. If symptoms worsen or your cat develops signs of a more serious infection, contact your veterinarian immediately. Some cats may experience lingering symptoms for several weeks, particularly if secondary complications develop.

Preventing Upper Respiratory Infections in Cats

Prevention is always better than treatment when it comes to upper respiratory infections. Several strategies can help reduce your cat’s risk of contracting a URI:

Vaccination

The FVRCP vaccine (also called the feline distemper vaccine) provides protection against feline herpesvirus and calicivirus. Routine vaccination is the most effective preventive measure and should be part of your cat’s regular health care regimen.

Reducing Exposure

Limiting your cat’s exposure to other cats, particularly unfamiliar cats or cats of unknown health status, can significantly reduce the risk of URI transmission. If you have multiple cats in your household, isolate any new or symptomatic pets to prevent the spread of infection to healthy cats.

Environmental Management

Maintain a clean living environment with good ventilation and regular cleaning of food bowls, water dishes, and litter boxes. This reduces the concentration of viral particles that could infect your cat.

Stress Reduction

Since stress can trigger reactivation of latent herpesvirus infections, maintaining a calm and enriching environment for your cat can help prevent recurring infections in cats who are carriers of the virus.

Frequently Asked Questions About Feline Upper Respiratory Infections

Q: Can upper respiratory infections in cats be fatal?

A: Most uncomplicated upper respiratory infections are not fatal, and cats recover naturally within one to two weeks. However, severe cases, particularly in young kittens, elderly cats, or immunocompromised cats, can develop serious complications like pneumonia that may be life-threatening if untreated.

Q: Can I catch a URI from my cat?

A: No, feline upper respiratory infections are species-specific and cannot be transmitted to humans. However, you can inadvertently transmit the infection from one cat to another by handling an infected cat and then touching a healthy cat, so proper hand hygiene is important.

Q: How long is a cat contagious with a URI?

A: Cats are typically most contagious during the acute phase of infection when symptoms are most severe. However, cats infected with herpesvirus remain carriers for life and may shed the virus intermittently, particularly during times of stress.

Q: Do I need to isolate my cat if they have a URI?

A: If you have multiple cats, isolating the infected cat is recommended to prevent transmission to other cats. This is especially important if your other cats are unvaccinated, very young, very old, or immunocompromised.

Q: Can antibiotics cure a viral upper respiratory infection?

A: No, antibiotics do not cure viral infections. However, they may be prescribed to prevent or treat secondary bacterial infections that can complicate viral URIs.