There is a much higher risk of brain blood clots from Covid-19 infection than there is from vaccines against the disease, British researchers said on April 15, after the rollout of inoculations was disrupted by reports of rare clots.

Six months after a Covid-19 diagnosis, more than 33 percent of people exhibited some form of brain damage, according to a study appearing in Lancet Psychiatry.

AstraZeneca’s diabetes drug Farxiga (dapagliflozin) failed to reach endpoints in a Phase III study as a potential treatment for hospitalized Covid-19 patients at serious risk of developing complications.

A joint China-World Health Organization (WHO) study into Covid-19 provided no credible answers about how the pandemic began, and more rigorous investigations are required – with or without Beijing’s involvement, a group of international scientists and researchers said on April 7.

The U.S. National Institutes of Health said on April 7 it had begun a mid-stage study to determine the risk of allergic reactions to Covid-19 vaccines made by Moderna Inc. and Pfizer Inc.

A critical component of the immune system known as T cells that respond to fight infection from the original version of the novel coronavirus appear to also protect against three of the most concerning new virus variants, according to a U.S. laboratory study released on March 30.

A readout from a Phase IIb/III trial showed intravenous RLF-100 (aviptadil) met the primary endpoint of improving survival and recovery at 60 days post-treatment for respiratory failure in critically ill patients with Covid-19, bolstering the case for sponsors NeuroRx and Relief Therapeutics to reapply for emergency use authorization (EUA).

The Covid-19 vaccines developed by Pfizer Inc. with BioNTech SE and Moderna Inc. are highly effective and reduced the risk of infection by 90 percent by two weeks after the second shot among healthcare personnel and first responders, according to a U.S. study released on March 29.

A joint WHO-China study on the origins of Covid-19 says the virus was probably transmitted from bats to humans through another animal, and that a lab leak was “extremely unlikely” as a cause, the Associated Press reported on March 29.

More young adults in the United States reported feeling anxious or depressed during the past six months of the COVID-19 pandemic, and fewer people reported getting the help they needed, according to a U.S. government study released on March 26.