What is second wave of coronavirus infection? | India News

NEW DELHI: Infectious disease experts, economists and politicians have raised concerns about a second wave of coronavirus infections that could worsen in the coming months.
Here is an explanation of what is meant by a second wave.
In infectious disease parlance, waves of infection describe the curve of an outbreak, reflecting a rise and fall in the number of cases. With viral infections such as influenza or the common cold, cases typically crest in the cold winter months and recede as warmer weather reappears.
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Fears about a second wave of Covid-19 stem in part from the trajectory of the 1918-1919 Spanish flu pandemic that infected 500 million people worldwide and killed an estimated 20 to 50 million people. The virus first appeared in the spring of 1918 but appears to have mutated when it surged again in the fall, making for a deadlier second wave.
Epidemiologists said there is no formal definition of a second wave, but they know it when they see it.
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Once a country or a region has been able to quash the exponential growth of coronavirus cases, the curve ‘flattens’. This is achieved by imposing lockdowns, intensive tracking of virus and large-scale testing of the population. However, in the absence of a vaccine, there is no way of quashing the virus completely. Hence, once the restrictions are relaxed, there is a possibility that the virus will return and the cases will once again start rising exponentially.
This increase in the number of cases is what is commonly referred to as ‘second wave’.
(With inputs from Reuters)



[Source :Times of India]

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