The risk of long COVID was two to three times higher after the initial infection (14.8%) than after first (5.8%) or second (5.3%) reinfections.
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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COVID-19 vaccination coverage in less socioeconomically vulnerable US counties was 1.9 percentage points higher than that in the most susceptible counties in the first 2.5 months of vaccine rollout, a study yesterday in Morbidity and Mortality Weekly Report (MMWR) finds.
Hot spots include the Upper Midwest, Northeast, and Middle Atlantic and may reflect variant spread.
Researchers who tracked B117 variant spread in the UK found that the virus quickly found its way into nursing homes.
Brazil's activity intensified after Carnival, and, unlike its first surge, spikes aren't contained to a few main hot spots.
Among 3,008 US nursing homes in counties in the top quartile of COVID-19 prevalence, those with larger proportions of racial minority residents, Medicaid participants, and fewer direct patient care hours experienced more coronavirus infections amid the pandemic, according to a research letter published yesterday in JAMA Network Open.
About 12% of the US population is fully vaccinated, and at least 21% have 1 dose.
The trial wasn't able to assess impact against severe disease because of the relatively young age of participants.
The European Medicines Agency and an expert WHO group are reviewing vaccine data.
Roughly 15.9 million asymptomatic US COVID-19 cases may have gone undetected as of Sep 30, 2020, which would double the cases reported to the Centers for Disease Control and Prevention (CDC) during that time, according to a research letter detailing a 6.6% nationwide SARS-CoV-2 seroprevalence rate.
Findings in more than 2.2 million people suggest B117 has a 61% higher death rate.
