NEW DELHI, June 8 -- Covid-19 belongs to the corona virus family having many known species. The early symptoms of corona virus infection are similar to that of common cold such as irritation in the nose, throat, blocked or runny nose, itching in the eyes, sneezing, dry throat, cough, fever and headache. Infection begins with upper nasal cavity, throat (pharynx), voice box (larynx) and upper parts of trachea. This primary level of infection remains for about 3-4 days before it goes down to the lungs. Once covid-19 virus reaches the lungs and become active, symptoms of bronchitis and pneumonia will appear and the condition of the patients will become serious and hence hospitalization will be needed. People with poor lung conditions such as as...