By TATIANA PROPHET

In July, the World Health Organization highlighted the success of two former Covid danger zones in India, Dharavi and Worli in south Mumbai, as examples that Covid can be “controlled.” Secretary General Tedros Adhanom Ghebreyesus cited the government’s aggressive action as key in the outcome. But he left out a key component that has been absent from other areas around the world that have not seen as dramatic a drop in cases and deaths: the use of anti-malaria drug hydroxychloroquine plus zinc and vitamin D given to thousands of residents and first responders in those slums.