India is also struggling with infrastructure like the requirement of oxygen and bedsthus it necessary to stop the spread of infection.
Masks are mainly intended to protect others from infection rather than just the wearer. Therefore, the recommendation is aimed not just at breaking the chain of transmission, but also at protecting those at highest risk.
Covid-19 spreads primarily from person to person through respiratory droplets, which travel in the air when someone coughs, sneezes, talks, shout or sings. These droplets can then spread to the mouths or noses of people in the vicinity, or may be breathed in.
As many people are asymptomatic people they can continue to spread the infection at home, at a faster pace. That is why, it is necessary to wear mask even in indoors. This will help the elderly and those with co-morbidities can be protected significantly, even if one member of the family has an asymptomatic infection. It can also reduce the local house outbreaks that have marked the second wave.
In a study by North Carolina Department of Health and Human Service it is cited that the risk is 1.5% (low) when both people are wearing masks, 5% (medium) when only the infected person is wearing a mask and uninfected persons are unmasked, 30% (high) if the infected person is not wearing a mask but the uninfected person is wearing one, and 90% (highest) when neither the infected nor the uninfected person is wearing a mask.
The US Centers for Disease Control and Protection (CDC) makes an almost similar recommendation. The CDC stresses that older people, specifically, should wear a mask when around people who don’t live in their household. Which effectively means that if a new person comes home.
The study of 335 people in 124 families found that the risk of household transmission was 18 times higher with frequent daily close contact with the primary case; face mask use by the primary case and family contacts before the primary case developed symptoms was 79% effective in reducing transmission.