Corona is not the only virus which affects the lungs. We have less harmful viruses that cause chest congestion, especially in hilly terrains. In winter, it is common in Punjab too. The best treatment for this, we have been told, is to sit outdoors, under the sun and breathe in fresh air. Sitting within the four walls or places where there is no access to air or sun fuels the spread of this virus. Some say the coronavirus is spreading fast in Europe and in America because these countries are in the grip of winter and people remain inside. It