(Reuters) - The following is a roundup of some of the latest scientific studies on the novel coronavirus and efforts to find treatments and vaccines for COVID-19, the illness caused by the virus.
TOKYO — Transportation minister Kazuyoshi Akaba says Japan will tighten border controls and limit the number of entrants to up to 2,000 per day to guard against the more contagious variants of the coronavirus.
NEW YORK/JERUSALEM (Reuters) - Pfizer Inc and BioNTech SE said on Thursday that real-world data from Israel suggests their COVID-19 vaccine is 94% effective in preventing asymptomatic infections, meaning it could significantly reduce transmission.
Natalie Lambert, an associate research professor at Indiana University School of Medicine, surveyed thousands of "long-hauler" Covid-19 patients, finding that specific symptoms tend to emerge at regular intervals — usually a week or 10 days — resulting in what she calls "waves of symptoms."
As states have begun vaccinating Americans with medical conditions that may raise their risk for a severe case of Covid-19, they are setting widely varying rules about which conditions to prioritize.
The morass of guidelines has set off a free-for-all among people with underlying health problems like cancer or Type 2 diabetes to persuade state health and political officials to add particular conditions to an evolving vaccine priority list.
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