The delta variant is twice as contagious as the original strain of the virus, and its ability to infect so many more people, including a small number of whom are fully vaccinated, is going to make it even harder to achieve herd immunity.
The delta variant is twice as contagious as the original strain of the virus, and its ability to infect so many more people, including a small number of whom are fully vaccinated, is going to make it even harder to achieve herd immunity.