The children's influenza virus is a respiratory illness that is caused by influenza virus. Influenza viruses are spread via droplets that release into the air after someone who has been infected speaks, coughs or sneezes. It can also be spread by touching contaminated surfaces and then touching one's eyes or nose. The flu virus can cause moderate or extreme symptoms in children. The symptoms can last for over a period of time. When you aim for a useful content about flu, check here.