A month old but does not appear to have been mentioned here.

Nature 7th April 2021

"As COVID-19 cases surge again in the United States, coronavirus variants are on the rise. But researchers fear that the country is ramping up surveillance of the coronavirus SARS-CoV-2 too slowly, allowing these variants — which evidence shows1,2 could make vaccines less effective — to spread undetected in one of the countries hit hardest by the disease.

Laboratories supported by the US government have doubled the rate at which they are sequencing SARS-CoV-2 genomes over the past two months. Still, the number of genomes that the country shared in the online genome repository GISAID in March represented only 1.6% of its positive COVID-19 cases that month. And the United States lags behind at least 30 countries in terms of the sequencing it has done throughout the pandemic, according to GISAID data"

Full article here

Why US coronavirus tracking can’t keep up with concerning variants