These patients usually have a classic influenza illness followed by a period of improvement lasting 1-4 days. Recrudescence of fever is associated with symptoms and signs of bacterial pneumonia. Reye's syndrome is a hepatic and central nervous system complication of influenza B and, less commonly, influenza A virus infection. This syndrome occurs almost exclusively in children and has a mortality of 10-40 percent. The mainstay for prevention of influenza since the late 1940's has been virus vaccines.
Gonorrhea is a common infectious disease that is usually transmitted by intimate sexual contact.
It is one of the oldest known human diseases. Gonorrhea has proven difficult to control, and its incidence is rising. Gonorrhea is now the most common of the reportable infectious diseases in the United States. The cell surface of the gonococcus has been intensively studied. Nonpilated strains are not pathogenic.