Influenza, commonly known as the flu, is an infectious disease caused by influenza viruses that poses a significant global health burden. Annually, approximately 1 billion cases occur worldwide, with 3-5 million severe cases and 290,000-650,000 deaths attributed to influenza-related respiratory illness.
Type
There are four types of influenza viruses: types A, B, C, and D.
Influenza A and B are the primary concern in humans and cause seasonal Epidemic.
Influenza C causes mild infections, mainly in children, while Influenza D is found in cattle and pigs but is not known to cause illness in humans.
Influenza spread by air droplets from cough and sneezing.Transmission can also occur through aerosols and contaminated surfaces.
MBH/AB