There are two ways that the flu virus is transmitted. First is through droplet infection: you can catch the flu by breathing in the virus contained in the droplets released out when someone with the flu coughs or sneezes. The other is indirect contact infection: you can catch the flu by touching your nose or mouth with a hand contaminated with the virus.
The virus of the flu is highly contagious, and your symptoms could become very serious. Symptoms such as fever, headache, and joint pain are usually more severe than when you catch cold.
Prevention will always be the best solution. Please always be sure to wash your hands and gargle after you come back inside, keep your room moderately damp with a humidifier (50-60%), occasionally let fresh air into your room, wear a mask, avoid crowded areas, get enough rest, and eat a well-balanced diet. When you think you might have caught the flu, please go to a clinic as soon as possible to receive treatment.