October 2, 2023, PHILADELPHIA, United States: Hungary's Katalin Kariko (L) and her American research partner Drew Weissman attend a press conference at the University of Pennsylvania in Philadelphia, the United States, on Oct. 2, 2023, after being awarded this year's Nobel Prize in physiology or medicine for their work leading to the development of COVID-19 vaccines using a new messenger RNA technology. (Kyodo).==Kyodo. (Credit Image: © Kyodonews via ZUMA Press)