Five kittens died Monday from a contagious feline virus in the SPCA of Niagara shelter - even though they had been vaccinated four times against the disease, according to Executive Director Amy L. Lewis.
The kittens had been in the shelter for about six weeks. They died of feline panleukopenia.
"They were vaccinated and should have had immunity, but they didn't," Lewis said.
She said she intends to contact the vaccine manufacturer to see if there have been any other reports of the vaccine being ineffective.
Cats in the adoption area were not exposed to the virus, Lewis said.
The shelter was closed Monday after the kittens were found dead, and Tuesday is a normal closure day, but Lewis said the shelter will reopen Wednesday.