US Covid infections rising again as upper midwest sees biggest jump

The fresh worsening of the coronavirus pandemic in the US comes as temperatures cool during the approach of winter, forcing people indoors where the virus is believed to spread more readily and may presage another wave.

It is also happening ahead of the Thanksgiving national holiday where tens of millions of Americans are expected to travel all over the country as families gather together in homes for the annual feast.

The seven-day moving average for the US was 93,196 on Friday. On October 25 it had been 70,271.

But several states with high rates of early vaccination take-up, including New Mexico, New Hampshire and Vermont, are also reporting elevated Covid case levels, suggesting that the efficacy of vaccines may be diminishing in terms of infection.

After federal health authorities approved booster shorts and vaccines for five-12 year-olds, the US is administering about 1.5m new doses a day, with a gently rising graph of vaccination rates still around 15 percentage points below the 80% threshold that epidemiologists would like to see.

On Friday, the FDA approved booster shots to all adults and took the extra step of urging people 50 and older to seek one. The Centers for Disease Control and Prevention (CDC) agreed to the new policy.

Some experts worry that placing attention on boosters may harm efforts to reach the 47m US adults who remain unvaccinated and widen disparities between wealthy nations and poorer countries who have not been able to acquire sufficient vaccines to treat more than a fraction of their populations.