nowadays, It has many disease. One of the most important is fluenza viruses can be detected year-round in thailand, flu viruses are most common during the rainy and winter. The exact timing and duration of flu seasons can vary, but influenza activity often begins to increase in October. People who have the flu often feel some of these symptom; Fever, Cough, Sore throat, Runny or stuffy nose. Muscle or body aches. Headaches. tiredness. Some people may have vomiting and diarrhea.