The Association between Influenza Vaccination and the Risk of SARS-CoV-2 Infection, Severe Illness, and Death: A Systematic Review of the Literature
https://pubmed.ncbi.nlm.nih.gov/33121070/
Interestingly, I found another article there with a nearly identical title.
The Association between Influenza Vaccination and COVID-19 and Its Outcomes: A Systematic Review and Meta-Analysis of Observational Studies
https://pubmed.ncbi.nlm.nih.gov/34065294/
Source:
The Association between Influenza Vaccination and the Risk of SARS-CoV-2 Infection, Severe Illness, and Death: A Systematic Review of the Literature https://pubmed.ncbi.nlm.nih.gov/33121070/
Interestingly, I found another article there with a nearly identical title.
The Association between Influenza Vaccination and COVID-19 and Its Outcomes: A Systematic Review and Meta-Analysis of Observational Studies https://pubmed.ncbi.nlm.nih.gov/34065294/
N=12, trend towards negative correlation. I think this is saying opposite of what title implies
N is the sample size, so they reviewed 12 studies.