With life starting to get back to normal in some cities across the United States, the Delta variant of COVID-19 could become the dominant strain in the country. In this week’s Sunday Focus, NBC News’ senior medical correspondent Dr. John…
With life starting to get back to normal in some cities across the United States, the Delta variant of COVID-19 could become the dominant strain in the country. In this week’s Sunday Focus, NBC News’ senior medical correspondent Dr. John…