Some pretty nice evidence that history of MMR or Tdap vaccination yields better outcomes in patients infected with COVID with T-cell mediated protection:
"Protective heterologous T cell immunity in COVID-19 induced by MMR and Tdap vaccine antigens"
https://www.biorxiv.org/content/10.1101/2021.05.03.441323v1
https://www.alviss.ai/fullpage/2356220/3
The study has enough power and propensity matching seems to have worked. I would have appreciated p-values in the table 2 though.
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