Fever after Feline Leukemia Vaccine in cats

170 reports to the FDA describe fever in cats given Feline Leukemia Vaccine. That is 21% of all reports for this medicine, compared with 3.2% across reports for all cat medicines, so it is reported unusually often with this medicine.

170Reports

52%Marked serious

45%Recovered

5.3%Died or euthanised

1 daysTypical onset

How soon it started

Same day

57 35%

1–2 days

40 24%

3–7 days

21 13%

1–4 weeks

38 23%

Over a month

8 4.9%

How the animals did

Recovered

76 45%

Still unwell when reported

67 39%

Died

1 0.6%

Euthanised

8 4.7%

Not known

18 11%

Problems reported at the same time

102 60%

95 56%

27 16%

27 16%

22 13%

20 12%

Didn't work as expected

18 11%

Weight loss

18 11%

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 fever in cats?: 170 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 1 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).

Fever with similar medicines

Fever after Rabies Vaccine 417 reports · 16% of its reports
Fever after Feline Core Vaccine 429 reports · 28% of its reports
Fever after Distemper-parvo Vaccine 20 reports · 7.2% of its reports

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