电话英语：Learn About Flu and Flu shot

What's a seasonal flu ?

Seasonal flu (also known as influenza) is a highly infectious [inˈfekʃəs](传染的)  illness caused by a flu virus [ˈvaiərəs]（病毒）.

The virus  infects [inˈfekts](感染) your lungs and upper airways（上呼吸道）, causing a sudden high temperature and general aches and pains（周身疼痛）.

You could also lose your appetite [ˈæpitait](食欲), feel nauseous [ˈnɔ:ʃəs, -zi:əs](想呕吐的) and have a dry cough. You may need to stay in bed until your symptoms get better.

The influenza vaccine [vækˈsi:nˈvækˌsi:n](疫苗) is the best way to prevent [priˈvent]（预防） the flu, and flu prevention should be a goal for everyone.

When should I get a flu shot?
Because flu season may begin as early as October and run through May, the best time to get a flu shot is in October or November. You can still get an influenza vaccine in December or later, but earlier may be more beneficial [ˌbeniˈfiʃəl](有利的) in preventing flu.