COVID-19: What You Need To Know About Herd Immunity And COVID-19 – Herd immunity happens when a large portion of a community (herd) becomes immune to a disease, making the spread of the disease from person to person unlikely, as a result, the whole community becomes protected, not only those who are immune.
Mostly, a percentage of the population must be capable of getting a disease in order for it to spread. This is termed as a threshold proportion.
If the proportion of the population that is immune to the disease is greater than this threshold, the spread of the disease will decline. This is called the herd immunity threshold.
How Much Of The Population Will Need To Be Vaccinated Against COVID-19 To Slow This Pandemic?
A vaccinated person acts as a barrier to slow and prevent the spread of the virus. The main aim is to get as many people vaccinated as possible so that more people are protected. The whole population benefits from a high vaccination coverage.
Once a population reaches a point of collective immunity where the disease is no longer likely to spread, it reaches the herd immunity threshold. The estimated herd immunity threshold for COVID-19 is that about 50% to 80% of the population will need to be vaccinated.
The more contagious a disease is, the greater the proportion of the population that needs to be immune to the disease to stop its spread. For example, the flu needs between 33% and 44% vaccinated to reach the herd immunity threshold. The measles is also a highly contagious illness, its estimated that 94% of the population must be immune to interrupt the chain of transmission.