With increasing concerns about COVID-19 reinfection, Pfizer and the National Institutes of Health are discussing potential studies regarding a longer treatment period with the antiviral medication Paxlovid.

In a peer-reviewed study published May 17 in PLOS Medicine, scientists found that mRNA-based COVID-19 vaccines were superior to adenovirus vector-based ones across major variants of the SARS-CoV-2 virus.

A chain of events possibly triggered by unrecognized infection with the SARS-CoV-2 coronavirus could be causing the mysterious cases of severe hepatitis reported in hundreds of young children around the world, researchers suggest.

Half of the COVID-19 patients discharged from a Chinese hospital in early 2020 still have at least one symptom two years later, a new study shows. Additionally, new findings suggest patterns of inflammatory proteins in the blood of people with long COVID may someday help guide individualized treatment.

Patients diagnosed with cancer more than a year before contracting COVID-19 and those not receiving active treatment may be no more vulnerable to worse COVID outcomes than those without cancer, according to a new study. Additionally, researchers warned that passengers are still at risk of coronavirus infection while traveling on airplanes and also in airports.

Severe obesity may weaken the effectiveness of COVID-19 vaccines in those who have never been infected with the coronavirus, according to a small Turkish study. Additionally, South African researchers have found infection with the Omicron variant of the coronavirus can significantly improve the immune system’s ability to protect against other variants, but only in people who have been vaccinated.

Additional reports of patients with long COVID who were helped by Pfizer Inc.’s oral antiviral treatment Paxlovid offer fresh impetus for conducting clinical trials to test the medicine for the debilitating condition, U.S. researchers said on May 5.

The Omicron variant of the SARS-CoV-2 virus is intrinsically as severe as previous variants, unlike assumptions made in previous studies that it was more transmissible but less severe, a large study in the United States found.

Asthma in children may worsen after an infection with the coronavirus, doctors warn. Additionally, among people who were previously infected with the coronavirus, a third dose of an mRNA vaccine from Pfizer/BioNTech or Moderna may not boost their protection against the Omicron variant of the virus, according to new data.

Following the record surge in COVID-19 cases during the Omicron-driven wave, some 58 percent of the U.S. population overall and more than 75 percent of younger children have been infected with the coronavirus since the start of the pandemic, according to a U.S. nationwide blood survey released on April 26.