This shouldn't need saying and yet the "herd immunity theory" is gaining more and more ground. so this is a useful reminder:
‘The head of the World Health Organization has warned against deliberately allowing coronavirus to spread in the hope of achieving so-called herd immunity, saying the idea is unethical.
‘“Herd immunity is a concept used for vaccination, in which a population can be protected from a certain virus if a threshold of vaccination is reached,” Tedros Adhanom Ghebreyesus said during a virtual press briefing.
‘For measles, for instance, it is estimated that if 95% of the population is vaccinated, the remaining 5% will also be protected from the spread of the virus. For polio the threshold is estimated at 80%.
‘“Herd immunity is achieved by protecting people from a virus, not by exposing them to it,” Tedros said. “Never in the history of public health has herd immunity been used as a strategy for responding to an outbreak, let alone a pandemic.”
‘Relying on naturally obtaining herd immunity would be “scientifically and ethically problematic”, Tedros said. “Allowing a dangerous virus that we don’t fully understand to run free is simply unethical. It’s not an option.”’