What is a bio bubble?

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The concept of a bio bubble was used in IPL and other sports

It is a safe and secure environment isolated from the outside world to minimise the risk of COVID-19 infection.
In other words, a bio-bubble is a secure sanitized area sealed from the outside world and only accessible by an approved set of people.
It permits only authorised sports persons, support staff and match officials to enter the protected area after testing negative for COVID-19.
The people themselves will have next to no physical contact with the outside world to minimize the risk of contracting the disease.
The players are required to stay inside their hotel facilities as a self isolation for a period of days ranging from seven to fourteen without interacting with fellow players.
The main purpose of the biosecure bubble is to minimize and prevent the risk of being contracted with the coronavirus through limiting the contact from the outside world.
Moreover, they will also travel from one bio-secure location to another as an isolated group.
The bubble is like an island which has islands inside them that only people who are permitted to access them, can be there.
Recently, the Board of Control for Cricket in India (BCCI) provided ‘bio secure bubbles’ in hotels, training sessions, matches and transportation.

Precautionary measures

Even before entering a bio-bubble, players and staff needed to undergo COVID-19 testing and self-isolation for a fixed period of time before entering the bubble.
Only if they test negative during that period, will they be allowed to enter the bubble.

How did it work in other sports?

The bio-bubble has been implemented in various sporting events to varying degrees of success.
The American basketball league NBA, the English Cricket Board and the Caribbean Premier League were the most clinical in setting up a bio-bubble