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With vaccine shortages looming, experts are debating whether it is important to receive two doses or whether it is better to give one dose to more people and give a second when the supply is better.
Abnormal functioning of the immune system is what characterises severe COVID, and can be driven by diabetes, obesity, sex and age.
Scientists were not surprised by reports on coronavirus reinfection; the lack of symptoms on reinfection is encouraging.
Some people who have never had COVID-19 have the antibodies to fight it – possibly from an earlier infection with a different coronavirus.