For their work on mRNA in COVID-19 vaccines, which they claim is a vital tool in halting the spread of the virus, Katalin Karikó and Drew Weissman have been given this year’s Nobel Prize in physiology or medicine.For their work on mRNA in COVID-19 vaccines, which they claim is a vital tool in halting the spread of the virus, Katalin Karikó and Drew Weissman have been given this year’s Nobel Prize in physiology or medicine.