… study, which was conducted in late 2020, before the roll-out of COVID-19 vaccines

… analysed the health records of 30,774 medical workers

… tracked 518 workers who tested positive for SARS-CoV-2 

… matched them to more than 2,000 study participants who had tested negative for the virus

… Those who had received an influenza vaccine that season were 30% less likely to test positive for SARS-CoV-2

… 89% less likely to develop severe COVID-19

… the number of severe cases was small in both groups    [ medRxiv BMJ ]

… reduces the odds that other studies that uncovered the same link were a fluke

… reduction in not just SARS-CoV-2 infections, but also disease severity, strongly suggests that the protection is genuine

… guesses that the benefits last for between six months and two years


                    medRxiv BMJ