Many people believe that strictly indoor cats will never be exposed to infectious diseases. Although it is true that indoors cats, when compared to cats that are roaming outside, have a reduced risk of being exposed to viruses, bacteria, fungi, or parasites, they still can be exposed to these organisms. Some microorganisms are transmitted by direct contact with infected animals; others are transmitted through vectors, such as mosquitoes, ticks, and fleas. Also, we can bring home disease through our clothes and shoes, The best way to keep your cat protected is by annual examinations and keeping your cat up to date with vaccines and year-round ectoparasite prevention.