India has one-sixth of total coronavirus caseload globally.
However, its case fatality rate is less than 2%, among the lowest in the world.
Researchers from Council of Scientific and Industrial Research suggest there is a link between income and deaths from Covid-19.
Poor hygiene, lack of clean drinking water and unsanitary conditions might have kept Indians from contracting severe Covid-19 infection.
A team of researchers found people died of Covid-19 in higher income countries.
Another group looked at microbes in the body, which help protect against disease.
They found sustained exposure to multiple pathogens since birth might have given Indians sturdier immunity.
The papers are yet to be peer reviewed.
Epidemiologists have attributed low coronavirus death rate in countries such as India to its demography.
They have a higher share of the younger population.
And it is the elderly who are at higher risk from the virus.
