In a cold or rainy season, influenza viruses spread very quickly. However, despite the people around them have flu, some people remain healthy. Scientists believe this phenomenon is because of the genes they have.
The influenza virus is transmitted through the air with coughing and sneezing. One-time cough will deploy around 100 thousand viruses into the air. And, when sneezing it doubled the number of influenza virus which will be two million. Besides that, influenza virus is highly contagious and affects 5 to 15 percent of the population every year. (more…)