A worst-case scenario would be a surge of one or more strains that evade our immune protections just as a predicted fall and winter surge hits the United States.
The FDA on Wednesday authorized Omicron-tailored COVID-19 booster shots from Moderna and Pfizer for children, a move that will expand the government s fall vaccination campaign.
New vaccine-escaping variants could take root in the US; a potential COVID-flu combo could test the health system; and vaccines and treatments could remain underused putting the brakes on immunity.