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).
Quick Answer. The side effects of a pneumonia vaccine include high fever, significant swelling at the injection site and sore muscles, according to WebMD. Some people may have an allergic reaction to the vaccine and experience serious side effects such as hives, dizziness, trouble breathing and fast heartbeats. Continue Reading.