Herd immunity against COVID-19 is “scientifically and ethically problematic”, said World Health Organization (WHO) Chief on October 12.
“Herd immunity is achieved by protecting people from a virus, not by exposing them to it,” said WHO Director-General Tedros Adhanom Ghebreyesus at a press briefing, adding further, “For example, herd immunity against measles requires about 95 percent of a population to be vaccinated.
The remaining five percent will be protected by the fact that measles will not spread among those who are vaccinated. For polio, the threshold is about 80 percent.” Adding further, he said that the world still doesn’t know enough about immunity to the Coronavirus disease, including how strong or lasting that immune response is or how is it different for different people. “We have some clues, but we don’t have the complete picture,” Mr. Tedros Adhanom Ghebreyesus said.