ANATOMY

Detailed explanation-1: -Influenza is caused by influenza viruses. Two types of influenza, A and B, cause outbreaks in people. Both types can cause mild to severe illness in all age groups. While influenza A viruses infect humans and other animals, influenza B viruses affects only humans.

Detailed explanation-2: -Flu is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and sometimes the lungs.

Detailed explanation-3: -Causes. Flu is caused by a virus that is spread from person to person. It causes seasonal epidemics each year.

Detailed explanation-4: -The flu is caused by an influenza virus. Most people get the flu when they breathe in tiny airborne droplets from the coughs or sneezes of someone who has the flu. You can also catch the flu if you touch something with the virus on it, and then touch your mouth, nose, or eyes.

Detailed explanation-5: -Influenza (flu) is a highly contagious viral infection of the respiratory tract that can cause severe illness and life-threatening complications (including pneumonia). It affects people of all ages. The flu is usually spread by breathing in droplets from coughs and sneezes that contain the virus.