Those infected with the flu are most contagious during the first three days, the CDC said. In some cases, however, people can spread the flu even before experiencing symptoms or up to five to seven ...

Meningococcal meningitis spreads through saliva and requires close contact. Viral meningitis can be caused by viruses like the measles virus and chickenpox. Fungal meningitis can occur when a fungus ...

Diarrhea is often contagious, especially when it's caused by viruses, bacteria, or parasites. Infectious diarrhea can spread by not washing hands after using the bathroom or touching contaminated ...