Didn't work as expected after Feline Core Vaccine in cats

The FDA has received 160 reports of didn't work as expected in cats after Feline Core Vaccine. That is 10% of all reports for this medicine, compared with 8.7% across reports for all cat medicines.

160Reports

44%Marked serious

22%Recovered

13%Died or euthanised

10 daysTypical onset

How soon it started

Same day

25 18%

1–2 days

16 12%

3–7 days

16 12%

1–4 weeks

55 40%

Over a month

24 18%

How the animals did

Recovered

35 22%

Still unwell when reported

91 57%

Died

16 10%

Euthanised

4 2.5%

Not known

14 8.8%

Problems reported at the same time

82 51%

78 49%

66 41%

45 28%

20 13%

17 11%

15 9.4%

13 8.1%

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 Core Vaccine cause didn't work as expected in cats?: 160 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 10 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).

Didn't work as expected with similar medicines

Didn't work as expected after Rabies Vaccine 126 reports · 4.9% of its reports
Didn't work as expected after Feline Leukemia Vaccine 56 reports · 7.0% of its reports

All reported side effects of Feline Core Vaccine in cats · Medicines most reported with didn't work as expected