Lethargy after Chlamydia Psittaci Killed + Feline Core Vaccine in cats

The FDA has received 31 reports of lethargy in cats after Chlamydia Psittaci Killed + Feline Core Vaccine. That is 55% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported unusually often with this medicine.

31Reports
45%Marked serious
35%Recovered
16%Died or euthanised
6 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
7 24%
1–2 days
5 17%
3–7 days
5 17%
1–4 weeks
10 34%
Over a month
2 6.9%

How the animals did

Recovered
11 35%
Still unwell when reported
3 9.7%
Died
2 6.5%
Euthanised
3 9.7%
Not known
12 39%

Problems reported at the same time

Loss of appetite
22 71%
Vomiting
12 39%
Elevated globulins
9 29%
Fever
9 29%
Weight loss
7 23%
Hyperglycaemia
6 19%
Liver problems
6 19%
Breathing problems
5 16%

Age of the animals

Under 1 year
8
1–3 years
10
4–7 years
3
8–11 years
3
12+ years
5

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 Chlamydia Psittaci Killed + Feline Core Vaccine cause lethargy in cats?
31 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 6 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).

Lethargy with similar medicines

All reported side effects of Chlamydia Psittaci Killed + Feline Core Vaccine in cats · Medicines most reported with lethargy