Tufts epidemiologist Dr. Shira Doron talks about two new omicron subvariants causing a spike in cases in South Africa and why new COVID-19 variants have been more contagious but less deadly.
Subscribe to WCVB on YouTube now for more: http://bit.ly/1e8lAMZ
Get more Boston news: http://www.wcvb.com
Like us: https://www.facebook.com/wcvb5
Follow us: https://twitter.com/WCVB
Instagram: https://www.instagram.com/wcvb5/
