Posted in Article Covid-19 variant JN.1 is now the leading cause of infections in the US. Here’s what you need to know | CNN 2023-12-31 Leave a Comment on Covid-19 variant JN.1 is now the leading cause of infections in the US. Here’s what you need to know | CNN The Omicron coronavirus subvariant JN.1 now makes up 44.2% of Covid-19 cases in the United States, according to the US Centers for Disease Control and Prevention. Source: Covid-19 variant JN.1 is now the leading cause of infections in the US. Here’s what you need to know | CNN