Fever after Feline Core Vaccine in cats

429 reports to the FDA describe fever in cats given Feline Core Vaccine. That is 28% 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.

429Reports

52%Marked serious

39%Recovered

8.9%Died or euthanised

4 daysTypical onset

How soon it started

Same day

98 24%

1–2 days

87 21%

3–7 days

59 14%

1–4 weeks

155 37%

Over a month

18 4.3%

How the animals did

Recovered

168 39%

Still unwell when reported

179 42%

Died

17 4.0%

Euthanised

21 4.9%

Not known

44 10%

Problems reported at the same time

Lethargy

297 69%

Loss of appetite

275 64%

Vomiting

98 23%

Didn't work as expected

66 15%

65 15%

63 15%

58 14%

41 9.6%

Age of the animals

Under 1 year

123

1–3 years

113

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 Core Vaccine cause fever in cats?: 429 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 4 days 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 Leukemia Vaccine 170 reports · 21% of its reports
Fever after Distemper-parvo Vaccine 20 reports · 7.2% of its reports

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