Watch | Significance of the 21-day lockdown period

A video on the reasons behind the 21-day lock down period

March 30, 2020 05:41 pm | Updated 05:41 pm IST

Prime Minister Narendra Modi announced a 21-day lockdown to reduce the spread of COVID-19.

Why 21 days? What is the significance of this number?

 The 21-day quarantine value has been interpreted from data from outbreaks in the past and present.

COVID-19 | Interactive map of confirmed coronavirus cases in India

Such a quarantine period has been discussed even in the context of Ebola . There is a scientific basis and epidemiological meaning to this number.

Its calculations are based on the incubation period of the virus in a human host.

It is the time between the entry of virus to the onset of symptoms.

The first 14 days is observed as the incubation period. The next 7 days is added for the residual infection to die out.

A recent study inferred that the median incubation period for COVID-19 is just over five days.

97.5% of people who develop symptoms will do so within 11.5 days of infection.

Public health experts also say this is the most effective way of preventing the spread of the infection from those already infected into the community.

Apart from the science behind it, a lockdown period  creates awareness of the situation.

Disinfection of all buildings, vehicles and surfaces are carried out in this period. This period also allows hospitals to prepare for the next phase of operations

Top News Today

Sign in to unlock member-only benefits!
  • Access 10 free stories every month
  • Save stories to read later
  • Access to comment on every story
  • Sign-up/manage your newsletter subscriptions with a single click
  • Get notified by email for early access to discounts & offers on our products
Sign in


Comments have to be in English, and in full sentences. They cannot be abusive or personal. Please abide by our community guidelines for posting your comments.

We have migrated to a new commenting platform. If you are already a registered user of The Hindu and logged in, you may continue to engage with our articles. If you do not have an account please register and login to post comments. Users can access their older comments by logging into their accounts on Vuukle.