Men, older adults and smokers are all more prone to COVID-19 infection because they have higher levels of a receptor the virus uses to enter and infect cells, MIT and Harvard study finds
A new study looked at 1.3 million cells from nasal, airway and lung tissue samples from 228 healthy people without COVID-19.
They found men, older adults and smokers had higher levels of ACE2, the receptor the coronavirus uses to enter and infect cells
This group also had higher levels of TMPRSS2, a gene that cuts open the Spike protein on the surface of the virus, which helps it enter cells
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