Opportunistic Infections and Related Diseases 500. Opportunistic Infections A definition of opportunistic infections. Description of the most common opportunistic infections with links to more detailed information. [Revised: September 12, 2006] 501. Candidiasis (Thrush) A description of candidiasis (thrush), including transmission, symptoms, diagnosis and treatment. [Revised: April 26, 2007] 502. Cryptosporidiosis…