No one knows how much immunity is conferred once patients recover from Omicron infection or how much immunity it confers against other and future variants.
The United States is among several countries known to be working on creating hypersonic missiles. The shortlist of great-power competitors includes Russia and China.
The ammunition shortage has been attributed to everything from the widespread increases in gun ownership during 2020 to pandemic supply chain constraints to consolidation among ammunition manufacturers to this year’s State Department sanctions on Russian ammunition.