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

56 reports to the FDA describe didn't work as expected in cats given Feline Leukemia Vaccine. That is 7.0% of all reports for this medicine, compared with 8.7% across reports for all cat medicines.

56Reports

45%Marked serious

21%Recovered

20%Died or euthanised

7 daysTypical onset

How soon it started

Same day

13 27%

1–2 days

6 13%

3–7 days

6 13%

1–4 weeks

15 31%

Over a month

8 17%

How the animals did

Recovered

12 21%

Still unwell when reported

22 39%

Died

4 7.1%

Euthanised

7 13%

Not known

11 20%

Problems reported at the same time

27 48%

21 38%

18 32%

13 23%

11 20%

9 16%

7 13%

7 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 Leukemia Vaccine cause didn't work as expected 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 7 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 Core Vaccine 160 reports · 10% of its reports

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