Despite fears of a third wave or new strain of covid virus 2021 the level of covid-19 infection worldwide has begun to decline. A number of issues have played a role there it must be said Vaccination is not the only reason because a very small part of the world as a population has been vaccinated so far The fact that social distance and hygiene rules have worked in some countries is well proven in some countries, hard immunity or mass resistance against corona is also being created. In the united states and brazil for example a significant portion of the population is already infected with corona a large part of them may not have come under the test.
The most important problem is the coronavirus mutation and there is a high probability that those who have been ill from one strain of coronavirus may not have immunity from the new strain. I have read the statements of scientists that large countries, especially if they are not engaged in quarantine measures, and as you know, for example, the Brazilian president was an ardent opponent, are an ideal environment for the emergence of new versions of the virus that are potentially more dangerous to health and not susceptible to the action of vaccines, so I would not rely heavily on the number of COVID 19 patients to develop collective immunity.im not sure, but this virus will always be a new mutation.
