Allergic reaction after Feline Leukemia Vaccine in cats

The FDA has received 33 reports of allergic reaction in cats after Feline Leukemia Vaccine. That is 4.1% of all reports for this medicine, compared with 0.9% across reports for all cat medicines, so it is reported unusually often with this medicine.

33Reports

97%Marked serious

42%Recovered

30%Died or euthanised

Same dayTypical onset

How soon it started

Same day

28 90%

1–2 days

1 3.2%

3–7 days

1 3.2%

1–4 weeks

0 0.0%

Over a month

1 3.2%

How the animals did

Recovered

14 42%

Still unwell when reported

7 21%

Died

7 21%

Euthanised

3 9.1%

Not known

2 6.1%

Problems reported at the same time

20 61%

15 45%

10 30%

10 30%

7 21%

6 18%

5 15%

5 15%

Age of the animals

Under 1 year

1–3 years

4–7 years

8–11 years

12+ years

About this medicine

Type: vaccine.

Mild, short-lived lethargy, soreness or a small lump at the injection site are the most commonly reported vaccine reactions.

Questions owners ask

Can Feline Leukemia Vaccine cause allergic reaction in cats?: 33 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
How soon after a dose was it reported?: In half of the reports with dates, it started within the same day of the first dose.
What should I do?: Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Allergic reaction with similar medicines

Allergic reaction after Rabies Vaccine 142 reports · 5.5% of its reports
Allergic reaction after Feline Core Vaccine 66 reports · 4.2% of its reports

All reported side effects of Feline Leukemia Vaccine in cats · Medicines most reported with allergic reaction