Didn't stop worms after Leptospirosis Vaccine in dogs

The FDA has received 109 reports of didn't stop worms in dogs after Leptospirosis Vaccine. That is 1.4% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported less often than average with this medicine.

109Reports
28%Marked serious
3.7%Recovered
6.4%Died or euthanised
31 daysTypical onset
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How soon it started

Same day
4 5.9%
1–2 days
3 4.4%
3–7 days
5 7.4%
1–4 weeks
22 32%
Over a month
34 50%

How the animals did

Recovered
4 3.7%
Still unwell when reported
17 16%
Died
4 3.7%
Euthanised
3 2.8%
Not known
81 74%

Problems reported at the same time

Diarrhea
25 23%
Vomiting
23 21%
Didn't work as expected
22 20%
Lethargy
12 11%
Loss of appetite
10 9.2%
Loose stool
8 7.3%
Blood problems
7 6.4%
Death
6 5.5%

Age of the animals

Under 1 year
29
1–3 years
29
4–7 years
33
8–11 years
12
12+ years
4

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 Leptospirosis Vaccine cause didn't stop worms in dogs?
109 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 31 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 stop worms with similar medicines

All reported side effects of Leptospirosis Vaccine in dogs · Medicines most reported with didn't stop worms