Antibodies induced by mRNA COVID-19 vaccines keep improving in quality for at least six months while the immune system continues to “train” its antibody-producing B cells, according to a new study. In other research, dysfunctional red blood cells contribute to the blood vessel injuries common in severe COVID-19, according to laboratory studies that also may suggest a way to treat the problem.

Moderna Inc. said on February 18 the company is developing three new vaccines based on the same technology used for its COVID-19 shot, including one for viral infection shingles.

The immune response to COVID-19 helps protect against reinfection, but that protection is weaker against Omicron than it was against earlier variants of the coronavirus, according to new data. In other news, protection provided by booster shots of the mRNA vaccines from Moderna Inc. or Pfizer Inc. and partner BioNTech SE starts waning quickly, according to data published in Feb. 11th’s Morbidity and Mortality Weekly Report from the U.S. Centers for Disease Control and Prevention (CDC).

U.S. health officials on Feb. 4 said they are considering lengthening the recommended interval between the first two doses of the most widely used COVID-19 vaccines to eight weeks to lower the risk of heart inflammation and improve their effectiveness.

People who die of severe COVID-19 have brain abnormalities that resemble changes seen in Alzheimer’s disease – accumulation of a protein called tau inside brain cells, and abnormal amounts of the protein beta-amyloid that accumulates into amyloid plaques – small studies found. In other news, seniors can safely get the high-dose flu vaccine and an mRNA COVID-19 booster dose at the same time, a new study confirms.

Sanofi still expects the French drugmaker’s COVID-19 vaccine to complete a phase 3 trial in first-quarter 2022 and reported a rise in fourth-quarter 2021 sales and earnings on Feb. 4.

Amidst news of current COVID-19 vaccines proving less effective against infections with Delta and Omicron variants of the disease, researchers are turning toward the development of pan-coronavirus vaccines that would work effectively against multiple variants. Scientists and researchers at the Walter Reed National Military Medical Center (WRNMC) in Maryland have been doing just that over the past two years and announced they are testing the vaccine in humans in a Phase I study.

A COVID-19 vaccine that can be produced locally in low-income and middle-income countries is yielding promising results in early clinical trials, researchers say. Other researchers believe that once the body has been “primed” by mRNA vaccines to recognize and attack the coronavirus, a booster containing purified versions of virus’ spike protein that could be given intranasally would have many advantages.

Moderna

Moderna Inc. started a mid-stage study, testing a booster dose of the company’s COVID-19 vaccine specifically designed to target the Omicron coronavirus variant, a day after rival Pfizer Inc. launched a similar trial.

Pfizer Inc. and BioNTech SE said on Jan. 25 they started a clinical trial to test a new version of their vaccine specifically designed to target the COVID-19 Omicron variant, which has eluded some of the protection provided by the original two-dose vaccine regimen.