Neutrophilia after Feline Core Vaccine in cats

The FDA has received 56 reports of neutrophilia in cats after Feline Core Vaccine. That is 3.6% of all reports for this medicine, compared with 0.7% across reports for all cat medicines, so it is reported unusually often with this medicine.

56Reports

64%Marked serious

18%Recovered

18%Died or euthanised

3 daysTypical onset

How soon it started

Same day

11 22%

1–2 days

13 26%

3–7 days

10 20%

1–4 weeks

14 28%

Over a month

2 4.0%

How the animals did

Recovered

10 18%

Still unwell when reported

27 48%

Died

1 1.8%

Euthanised

9 16%

Not known

9 16%

Problems reported at the same time

39 70%

37 66%

24 43%

23 41%

17 30%

16 29%

16 29%

16 29%

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 neutrophilia in cats?: 56 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 3 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).

Neutrophilia with similar medicines

Neutrophilia after Rabies Vaccine 72 reports · 2.8% of its reports
Neutrophilia after Feline Leukemia Vaccine 24 reports · 3.0% of its reports

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