In short, yes. You can vaccinate a cat infected with FIV, but there are some caveats.

أهم النقاط
FIV-positive cats should be vaccinated with core vaccinations, but only through inactive variants.
Health status, age, risk level, and vaccine type are factors considered when vaccinating cats with FIV.
Vaccines provide significant protection, offer reduced disease severity, and comply with pet ownership laws.
What Is FIV in Cats?
Feline immunodeficiency virus is a deadly virus that compromises a cat’s immune system, making them vulnerable to several infections and diseases. The pathogen mainly targets white blood cells, which are the main components of a cat’s defense.
FIV generally spreads through deep bite wounds from catfights, and many infected cats don’t show symptoms. However, those who show signs may exhibit:
Recurring infections
Loss of appetite and weight
Fever
Enlargement of lymph nodes
Lethargy
In severe cases, affected cats may experience symptoms such as:
Severe muscle wasting
Chronic diarrhea and vomiting
Mouth ulcers, gingivitis, and tooth loss
Seizures, tremors, and behavioral shifts
Cancer

What Do Vets Consider When Vaccinating FIV-Positive Cats?
When it comes to cats with FIV, we take the extra steps to ensure they can safely receive their core vaccinations.
Individual Risk Assessment
One of the first things we’ll consider is the cat’s lifestyle. Indoor-only cats with no exposure to other cats and carriers may not urgently require boosters, while those staying outdoors do because of the risk level.
Health Status and Age
The cat’s health will also be taken into account. Vaccination should be done only if the cat is asymptomatic or healthy. Cats with severe symptoms shouldn’t be vaccinated, as the vaccines might be ineffective or may even cause stress.
This means that if the cat is showing signs, we’ll wait until they recover before administering the vaccines.
Age is also a factor we consider. Kittens, adults, and seniors have different responses to the vaccines. This helps us determine the timing and frequency of the doses.
Type of Vaccine
We recommend inactivated vaccines rather than modified-live virus vaccines for FIV-positive cats. This is because they are safer and cannot cause disease, unlike the MLVs, which can.
Along with this, we make sure to avoid excessive vaccination. Too much unnecessary stimulation of the immune system could be counterproductive.
Local Laws and Requirements
In line with the UAE’s regulations for pet safety, rabies and core vaccinations are required, even for FIV-positive cats.
Cats with FIV have a significantly weakened immune system. This means that even if vaccines are helpful to protect them from various diseases, they must be used carefully and strategically. The goal is to protect your cat without unnecessarily stressing the immune system.
In some cases, the vaccines might even be less effective. But first, let’s talk about what FIV really is.
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