Etiology. Influenza viruses are single-stranded negative sense RNA viruses of the family Orthomyxoviridae. Three types (A, B, and C) of influenza viruses infect humans. Type A and B viruses are known to cause significant human disease. The genome contains
WASHINGTON (Reuters) - The U.S. government shut down at midnight on Friday after Democrats and Republicans failed to reach a last-minute deal to fund its operations, divided in a bitter dispute over immigration and border security.
In a dramatic late-night session