Letter: The COVID battle isn’t over yet

On May 8, 1980, the World Health Organization officially declared that smallpox had been eradicated. This was arguably one of the greatest scientific achievements of humankind.Since then, a significant number of other infectious diseases are disappearing. Polio, measles, mumps, chicken pox, several flavors of hepatitis, meningitis, pertussis, tetanus, etc., have been eliminated in modern countries. Public health constraints and vaccinations are the two most effectively used weapons to defeat sco