Seven years ago ,the H7N9 virus ( 病毒 ) hit Shanghai, Anhui, Jiangsu, Zhejiang and so on. It seemed that most people who were infected( 被感染 ) with H7N9 had the common flu. Some people suffered from a fever or a cough. Don’t be afraid—it’s not easy to be infected with the virus. Here is some advice to help you protect ( 保护 ) yourself when it comes. Wash your hands. You need to wash your hands with soap and hot water before you eat, after you use the toilet ( 厕所 ) , and after you touch animals, because your hands may carry viruses. Cover your nose and mouth. When someone ( 某人 ) sneezes( 打喷嚏 ) or coughs, flu viruses can travel as far as one meter through the air, so you’d better stand a proper distance ( 距离 ) while talking to someone who has a cold. And always cover your mouth and nose with a piece of paper when you sneeze or cough, and then clean your hands. Wear a mask( 口罩 ). Some doctors say that masks can stop the flu as much as 80%, but if you don’t wash your hands often, it’s no use wearing a mask. And it’s necessary to wear the mask in the groups of people. Do sports often. Exercises will help make your body strong enough to resist the virus.