influenza (flu)
influenza (flu) is a viral infection, People often use the term "flu" to describe any kind of mild illness, such as a cold or a stomach virus, that has symptoms like the flu. But the real flu is different. Flue symptoms are usually worse than a cold and last longer. The flu usually does not cause vomiting or diarrhea in adults.Most flu outbreaks happen in late fall and winter. Because symptoms may not start for a couple of days, you may pass the flu to someone before you know you have it.What causes the flu?The flu is usually caused by flu viruses A and B. There are different strains of the flu virus every year. What are the symptoms The flu causes a fever, body aches, a headache, a dry cough, and a sore or dry throat. You will probably feel tired and less hunger than usual. The symptoms usually are the worst for the first 3 or 4 days. But it can take 1 to 2 weeks to get completely better.