The good news just keeps coming for Regeneron Pharmaceuticals, a US biotech company whose potent cocktail of antibodies has been shown to not only treat Covid-19 infections, but also prevent them.

The cocktail, dubbed Regen-Cov, is not a vaccine but an effective treatment for mild to moderate Covid; it also prevents symptomatic Covid among those who have been exposed to it. Not just that, but in recent clinical trials it’s been proven to respond to highly transmissible new Covid variants...

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