Lameness after Feline Core Vaccine in cats

114 reports to the FDA describe lameness in cats given Feline Core Vaccine. That is 7.3% of all reports for this medicine, compared with 0.6% across reports for all cat medicines, so it is reported unusually often with this medicine.

114Reports

39%Marked serious

40%Recovered

4.4%Died or euthanised

4 daysTypical onset

How soon it started

Same day

19 17%

1–2 days

24 21%

3–7 days

26 23%

1–4 weeks

41 37%

Over a month

2 1.8%

How the animals did

Recovered

46 40%

Still unwell when reported

54 47%

Died

2 1.8%

Euthanised

3 2.6%

Not known

9 7.9%

Problems reported at the same time

Lethargy

65 57%

Fever

63 55%

Loss of appetite

61 54%

Injection site reaction

20 18%

19 17%

18 16%

18 16%

15 13%

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 lameness in cats?: 114 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).

Lameness with similar medicines

Lameness after Rabies Vaccine 103 reports · 4.0% of its reports
Lameness after Feline Leukemia Vaccine 54 reports · 6.8% of its reports

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