influences

Influenza is a contagious disease most commonly spread from person to person via coughs and sneezes. This happens when an infected person coughs or sneezes, passing the virus through the air to a nearby person’s nose or mouth. The virus is also contracted when a healthy person touches his/her mouth or nose after touching an infected surface or object.
Adults who are infected with the virus are contagious and can spread the disease from one day before their flu symptoms develop and up to five days after they become sick. Children may be contagious for more than seven days. As the disease has an incubation period of one to four days, many people pass the virus without knowing he/she is sick.
Courtesy: Centers for Disease Control and Prevention