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Updated on September 23rd, 2025
Pet's info: Cat | American Shorthair | Female | unspayed | 6 lbs
Is it safe to vaccinate a pregnant cat if they have never been vaccinated before?
4 Answers

Answered By Angel Alvarado, LVT
Licensed Veterinary Technician
Published on June 28th, 2017
Answered By Sara Farmer, DVM
Veterinarian
Published on August 24th, 2018
Vaccines are generally not recommended in pregnant animals unless there is a high risk of exposure (such as in a shelter setting). I would think it woulld be best to delay the vaccines a little and update them after the kittens are born, but you should check with your vet first to see what they would recommend. They know the overall risk in your area and her vaccine and health history.
1Pet Parents found this answer helpful
Answered By Mirissa Duncil, DVM
Veterinarian
Published on September 5th, 2017
Hi and thanks for using Petco Pet Education Center, formerly Petcoach!
I generally do not recommend vaccinations in sick or unhealthy animals-it will not be beneficial if they are already ill. It is impossible to tell without seeing her (and even then, most times) if the mother will abort the new kittens or not. It depends on the severity of the illness. Likely the illness will require a trip for the animals affected to your local veterinarian for antibiotics and further treatment-usually if it is only a respiratory infection it is quite treatable. I recommend taking the affected ones as soon as you can-early treatment minimizes complications.
Separate them from any other cats you have until they are well again-clean all food dishes and litter boxes they have used as well.
1Pet Parents found this answer helpful
Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS
Veterinarian
Published on February 27th, 2018
Ideally diagnosis of pregnancy should be performed before vaccinating as some of them could potentially affect the kittens.
If your cat is already vaccinated will pass part of the immunity through the colostrum.
Please ask your veterinarian to confirm diagnosis first.
Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.
1Pet Parents found this answer helpful