1 Feline stomatitis is a severe, painful inflammation of a catâs mouth and gums. 2  Dental disease, certain viruses, and some other inflammatory conditions can cause feline stomatitis.  The long-term outcome can vary. Many cats require long-term treatment to control the condition.
Vaccine Adverse Event Reporting System. The Vaccine Adverse Event Reporting System (VAERS) is a United States program for vaccine safety, co-managed by the U.S. Centers for Disease Control and Prevention (CDC) and the Food and Drug Administration (FDA).
Problems that could happen after any vaccine: 1  Any medication can cause a severe allergic reaction. 2  Such reactions from a vaccine are very rare, estimated at fewer than 1 in a million doses, and usually happen within a few minutes to a few hours after the vaccination.roblems that could happen after any injected vaccine: 1  People sometimes faint after a medical procedure, including vaccination. 2  Some people get severe pain in the shoulder and have difficulty moving the arm where a shot was given. 3  Any medication can cause a severe allergic reaction.