Sri Lanka, Nov. 8 -- Infectious diseases have been existing since the beginning of life on earth, so that what the world is now experiencing with Covid-19 is nothing new for the human population. What is new is the external environment in which we are forced to fight it. As in any other process of solving problems we have to use our knowledge from the past, analyse the present situation and identify the problem in the proper perspective and then choose the most efficient way to solve the problem, while minimising possible negative effects on our future that may arise from that particular solution.

Even though diseases and illnesses have plagued humanity for thousands of years the frequency has been rising with the increased population, m...