One India's premier institutions- IIT- Kanpur has briefed Reuters news agency of the probable miscalculation of India Covid numbers. This is based on their own mathematical model.
"According to our mathematician model estimates, at present 30% of the country's population is infected, while 50% of the people will have been infected by February 2021. The committee member estimates that the coronavirus of the central government is much higher than the Serological Surveys, as it was reported to infect 14% of the country's population by September. Meanwhile, research at Oxford University has revealed that patients recovering from the corona are being found to have symptoms for a few months. According to this study, more than half of the hospital-discharged corona patients complained of breathing problems, body aches, weakness and stress for the next two to three months." - https://english.newstracklive.com/news/indian-institute-for-technology-manindra-agrawal-statement-on-corona-crisis-mc23-nu764-ta294-1124922-1.html