It is possible the sneezing is secondary to the vaccine, which is usually not a problem. However, if they are running a fever, not acting like themselves, or have changes with their nose or eyes, they must be evaluated. Most cats carry the Feline Herpes Virus (only contagious from cat to cat). Under periods of stress they develop a flare-up which looks like a cold. They are treated symptomatically (like viruses in people). If you suspect a fever, or if the symptoms are getting worse over 5-7 days, they need to be evaluated. I hope this information is helpful. Sincerely, Christine Simon D.V.M. 813 877 6369
Ask a Vet:
I had my cats in for vaccinations on the 19th. Both were vaccinated for kennel cough, my female is fine but my male has been sneezing for 3 days. No discharge from his eyes, he is still eating, he isn’t coughing but he appears to be running a fever today. Does he need to be seen or is this a reaction to the vaccine?