https://www.dailymail.co.uk/news/article-9265495/Mystery-plunge-coronavirus-cases-India-baffles-experts-country-recorded-11m-infections.html
Why did COVID fail to take off in India and has now collapsed? Mystery plunge in coronavirus baffles experts
At one point India looked as though it might surpass US with highest case toll
But now country is reporting 11,000 cases a day, compared to peak of 100,000
Scientists have suggested some areas of India have reached herd immunity or that Indians may have some preexisting protection from the virus