SARS and MERS did not provide immunity against each other nor against SARS2. There is no indication that other common coronavirus infections such as those that

SARS and MERS did not provide immunity against each other nor against SARS2. There is no indication that other common coronavirus infections such as those that cause 10-30% of common cold cases world wide provide any immunity to the current virus. Also given the sheer size of India it’s unlikely that there would be a pathogen that provides immunity on this scale that would not have been identified previously since it would end up causing complications and deaths in some infections even if at much lower rates than previous epidemics. If it also managed to spread across India It would’ve also spread worldwide. Lastly like someone else mentioned migrants native to the region where hit pretty hard everywhere else.