The combined vaccine elicited higher immune response against SARS-CoV-2.
Plaque growth can lead to a higher risk of heart attack, stroke, and other life-threatening cardiovascular events for as long as 1 year.
Post-exertional malaise, or exercise intolerance, was seen in 36% of those with long COVID.
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The company says it began a trial among adolescents; results are expected in 2021.
The US becomes the first nation to have 2 authorized COVID-19 vaccines with clear, compelling efficacy data.
Vaccine distribution to states is hitting some unexpected snags, as the surge ahead of Christmas accelerates, putting record numbers of Americans in the hospital.
Though the studies don't settle questions about the 2 antibody treatments, they shed light on potential clinical benefits.
COVID activity remains intense in Europe, and South Africa is probing a new SARS-CoV-2 variant.
A Latin American study of children with COVID-19–related multisystem inflammatory syndrome (MIS-C) in The Pediatric Infectious Disease Journal found higher rates of the disease among Latin/Hispanic children compared with other global estimates.
An HHS official says the US may ship 7.9 million doses to states next week if the Moderna vaccine is approved, including 5.9 million doses of Moderna's vaccine.
In just 6 months the virus killed an estimated 173,000 people, and in 5 months about 4,500 young adults.
US officials report new single-day highs in cases (247,403), hospitalizations (113,090), and deaths (3,656).
Only 62.4% of 16-month-old US children received the MMR vaccine from June to August, down from 72.0% before the pandemic.
