The United States has been in a "protracted health crisis" for decades, the researchers say.
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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US social distancing steps will extend through April.
US activity is surging in New York and several other states and cities.
Also, new studies highlight virus shedding and before-symptom transmission.
The US depends heavily on drugs made in other countries, especially India and China.
A day after topping 500,000 global cases, the total is poised to pass 600,000.
Hospitalization rates in Los Angeles and New York City are doubling every few days.
Cases are accelerating in multiple hot spots, causing the global total to climb from 400,000 to 500,000 cases in only 2 days.
Chinese researchers say that they can't rule out mother-to-baby transmission in 3 infected newborns.
The federal government needs to take leadership to get past our current piecemeal approach to addressing shortages.
The ECDC says the risk is very high if mitigation measures are inadequate.