Following CDC approval, new 'bivalent' shots -- which are half the original vaccine and half an Omicron-targeted version -- expected to roll out across America

FDA says tweaked Pfizer and Moderna shots to be available as early as September, but urges fourth dose of existing vaccine for eligible adults

Cases confirmed in Israelis returning from abroad; scientists say the BA.2.75 COVID variant may be able to spread rapidly and get around immunity from vaccines and past infection

US doctor calls BA.5 'hypercontagious' and WHO says pandemic 'nowhere near over' as virus continues to mutate worldwide and cause concern among experts

Scientists say BA.2.75 variant may be able to get around immunity from vaccines and previous infection, but unclear if it causes more serious disease than other Omicron strains

Albert Bourla insists his company's original vaccine is safe for children as young as 6 months, says he's aiming to create vaccine that offers yearlong protection

Prof. Ran Balicer says current spike reflects waning immunity, a new variant and summer AC use — but widespread unreported home testing means we don't know yet how severe it'll be

Salman Zarka says current spike being fueled by Omicron subvariant, is not as serious as previous outbreak; also urges Israelis to mask indoors

CEO says US biotech firm intends to submit new vaccine to regulators, will gear up to start supplying shots by August in anticipation of infection spike in the fall

Number of seriously ill patients continues to rise, reaching 180; COVID czar says he believes verified cases are only 'tip of the iceberg' due to low testing rates