Kathmandu, Nov 22: Doctors say the risk of influenza (flu) has increased with the drop in mercury. Influenza is caused by a viral infection, and the virus becomes more active during winter, making people of all age groups susceptible.According to general physician Dr Parshuram Ghimire, cases of respiratory complications rise during this season. The risks of infections affecting the chest, mouth, nose, and lungs are higher at this time. The flu virus spreads through droplets released when an infected person coughs or sneezes and these droplets can also reach the lungs.Similarly, touching surfaces contaminated with the virus and then touching...