A recent study published by the Worcestershire University of Culinary Sciences found a link between the ingestion of the English delicatessen and the prevention of severe COVID-19 cases.

This double-blind study suggests that nothing more than a healthy spoonful of marmite a day reduces the risk of COVID by 9.45% by comparison of the control group who were given marmite placebo.
No side-effects have been shown, bar the usual ones following the immediate ingestion of marmite and notably the bad breath.

This landmark study have come up all the way to the ears of British officials who are supposedly ready to inflate the price of marmite for importation.
This study has yet to confirm if those results can be achieved with the infamous Australian copycat, the vegemite.