How many types of dengue viruses are there ... DEN-2, DEN-3, and DEN-4. These four viruses are called serotypes because each has different interactions with the antibodies in human blood serum.

Older adults who were exposed to seasonal flu viruses that circulated prior to 1968 are more likely to have some protection ...

Prior exposures to specific types of seasonal influenza viruses promote cross-reactive immunity against the H5N1 avian influenza virus, according to new research from the Perelman School of Medicine ...