09 Aug Understanding and Treating Feline Upper Respiratory Infections

What is a Feline Upper Respiratory Infection (URI)?

A Feline Upper Respiratory Infection (URI) is a contagious illness that affects the upper part of a cat’s respiratory system, including the nose, throat, and sinuses. It is akin to the common cold in humans, though the causes and symptoms differ.

URIs are common in cats, especially in shelters, catteries, or multi-cat households. These infections can be caused by a variety of pathogens, with the most common being viruses, though bacteria can also play a significant role.

Causes of Feline Upper Respiratory Infections

1. Viruses:
   • Feline Herpesvirus (FHV-1): Also known as feline viral rhinotracheitis (FVR), this virus is one of the most common causes of URIs in cats. It is highly contagious and spreads through direct contact with an infected cat or its secretions (e.g., saliva, nasal discharge, or eye discharge). Once a cat is infected, it can become a lifelong carrier of the virus, which may reactivate during times of stress.
   • Feline Calicivirus (FCV): Another major viral cause of URIs, FCV is also highly contagious and can lead to more severe symptoms than FHV-1, such as mouth ulcers, fever, and joint pain. Cats can shed the virus even when they show no symptoms, making it challenging to control outbreaks.
2. Bacteria:
   • Chlamydia felis: This bacterium primarily affects the eyes, leading to conjunctivitis, but can also contribute to upper respiratory symptoms. It is less common than viral causes but can exacerbate the severity of a URI.
   • Bordetella bronchiseptica: This bacterium is known for causing kennel cough in dogs but can also infect cats, leading to coughing, sneezing, and nasal discharge.
3. Environmental Factors: Stress, overcrowding, poor ventilation, and unsanitary living conditions can all contribute to the spread of URIs. Cats in shelters or catteries are particularly vulnerable due to the close quarters and high population density.

Symptoms of Feline Upper Respiratory Infections

The symptoms of a feline URI can range from mild to severe, depending on the causative agent and the cat’s overall health. Common symptoms include:

• Sneezing
• Nasal discharge (clear or colored)
• Coughing
• Conjunctivitis (inflammation of the eyes)
• Eye discharge
• Fever
• Loss of appetite
• Lethargy
• Mouth ulcers (more common with FCV)

 

A URI can lead to secondary bacterial infections, pneumonia, or other complications in severe cases, especially in kittens or immunocompromised cats.

Why Do Feline Upper Respiratory Infections Happen?

1. Contagion and Spread: URIs are highly contagious, especially in environments where cats are in close contact, such as shelters, catteries, or multi-cat households. The pathogens responsible for these infections can be spread through direct contact with an infected cat or its secretions. Additionally, they can be transmitted indirectly through contaminated objects like food bowls, litter boxes, or bedding.
2. Stress and Immunity: Stress is a significant factor in the development and recurrence of URIs. Stress can weaken a cat’s immune system, making it more susceptible to infections. Common stressors include environmental changes, the introduction of new animals, overcrowding, and even travel. Cats that are carriers of FHV-1 are particularly prone to stress-induced reactivation of the virus.
3. Age and Health: Kittens, elderly cats, and cats with weakened immune systems (due to illness or medications) are at a higher risk of developing URIs. Kittens are especially vulnerable because their immune systems are not fully developed, and they are often exposed to other cats in shelters or breeding facilities.
4. Vaccination Status: Vaccination plays a crucial role in preventing URIs. Cats not vaccinated against FHV-1 and FCV are more likely to contract these infections. While vaccines may not completely prevent the disease, they can significantly reduce the severity of symptoms and the likelihood of complications.

Treatments

When a cat develops a Feline Upper Respiratory Infection (URI), prompt and proper care is essential to ensure a quick recovery and to prevent complications. While some URIs may resolve independently, others require more active intervention. Below are various ways an owner can treat and manage a cat suffering from a URI.

1. Consultation with a Veterinarian

Before starting any treatment, it is crucial to consult with a veterinarian. URIs can vary in severity, and a professional assessment ensures that the cat receives the appropriate care. The veterinarian may conduct tests to identify the specific pathogen causing the infection, which can guide the treatment plan. In some cases, medications may be prescribed, especially if there is a risk of secondary bacterial infections.

2. Medications

• Antibiotics: The veterinarian may prescribe antibiotics if a bacterial infection is suspected or confirmed. Common antibiotics used in treating feline URIs include doxycycline and amoxicillin. It is important to follow the veterinarian’s instructions carefully and complete the entire course of antibiotics, even if the cat appears to be improving.
• Antiviral Medications: While most viral infections are self-limiting, in some cases, antiviral medications such as famciclovir may be prescribed to help reduce the severity of symptoms, particularly for cats with chronic or severe herpesvirus infections.
• Eye drops or ointments: If the cat has eye involvement, such as conjunctivitis, the veterinarian may prescribe medicated eye drops or ointments. These help reduce inflammation and prevent or treat secondary bacterial infections in the eyes.

3. Supportive Care

Supportive care plays a significant role in helping a cat recover from a URI. Here are some important aspects of supportive care:

• Hydration: Ensuring that the cat stays hydrated is critical. Cats with URIs may lose their sense of smell due to nasal congestion, leading to a decreased appetite and reluctance to drink water. Owners can encourage fluid intake by offering wet food with a higher water content or by adding water or low-sodium chicken broth to their food. In severe cases, a veterinarian may administer subcutaneous fluids.
• Nutritional Support: Cats with URIs often lose appetite, which can lead to weight loss and weakened immune function. To entice a cat to eat, owners can offer strong-smelling, palatable foods, such as canned tuna or baby food (ensure it contains no harmful ingredients like onions or garlic). Warming the food slightly can also enhance its aroma and appeal.
• Humidity and Steam Therapy: Keeping the cat humid can help alleviate nasal congestion. Owners can use a humidifier in the room where the cat spends most of its time. Alternatively, steam therapy can be provided by placing the cat in a bathroom with the shower running hot water (without placing the cat directly in the water). The steam helps loosen mucus and makes breathing easier.
• Nasal Drops: Saline nasal drops can moisten and clear a cat’s nasal passages. Owners should only use products recommended by their veterinarian and administer the drops gently to avoid stressing the cat.

4. Isolation and Rest

• Isolation: If there are other cats in the household, it’s important to isolate the infected cat to prevent the spread of the URI. The sick cat should be kept in a separate room with litter box, food, and water bowls.
• Rest: Rest is essential for recovery. Ensure the cat has a quiet, comfortable space to rest without being disturbed by other pets or household activities.

5. Stress Reduction

Stress can exacerbate the symptoms of a URI and prolong recovery. Owners should aim to create a calm environment for the cat by minimizing noise, avoiding changes in routine, and providing a safe, cozy space. If the cat is a carrier of feline herpesvirus, stress reduction is particularly important to prevent flare-ups.

6. Monitoring and Prevention

Ensuring that the cat’s vaccinations are current, maintaining good hygiene, reducing stress, and providing a healthy diet all contribute to a stronger immune system and reduce the likelihood of recurring infections.

Owners should closely monitor the cat’s condition throughout the illness. Watch for any worsening symptoms, such as difficulty breathing, refusal to eat or drink, or signs of dehydration. If the cat’s condition does not improve within a few days or if symptoms worsen, a follow-up visit to the veterinarian is necessary.

Conclusion

Treating a Feline Upper Respiratory Infection involves a combination of veterinary care, supportive home treatment, and proactive prevention. By following these guidelines, owners can help their cats recover more quickly and comfortably and minimize the risk of complications.