Over the weekend both the Food and Drug Administration and the Centers for Disease Control and Prevention (CDC) gave the green light to Johnson & Johnson's COVID-19 vaccine, making it the first one-dose option available to Americans.The newly approved vaccine is expected to arrive in arms as soon as tomorrow.
A total of 4 million doses will be administered across the United States by the end of the week, Reuters reported. Johnson & Johnson previously said it aims to have 20 million doses delivered to Americans by the end of the month, and 100 million doses by June.Biden administration officials warned that availability of the Johnson & Johnson vaccine will be sporadic and limited, most likely until April.'Very real threat' of variantsThe