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Pfizer and its German partner BioNTech have filed proceedings at the High Court of England and Wales, seeking a judgment that their COVID-19 vaccine, based on mRNA technology, does not infringe on CureVac’s European patents, according to a regulatory filing on Friday.

Moderna sued Pfizer and its German partner BioNTech on Friday for patent infringement in the development of the first COVID-19 vaccine approved in the United States, alleging they copied technology that Moderna developed years before the pandemic.

The United States has administered more than 7,300 doses of Novavax Inc.’s (NVAX.O) COVID-19 shot, which health officials hope will convince more people to opt for vaccinations as it is based on a technology that has been in use for decades.

CureVac has filed a patent lawsuit in Germany against BioNTech over its use of mRNA technology, marking one of the first known cases of a company going to court amid the fierce competition to develop a vaccine against the coronavirus.

Moderna announced that the company’s Omicron-containing COVID-19 booster candidate, mRNA-1273.214, demonstrated superior antibody response against Omicron in its Phase II/III study. The booster contains the original COVID-19 vaccine, Spikevax, as well as a vaccine targeting the Omicron variant.

At the American Society of Clinical Oncology (ASCO)’s annual meeting this weekend, BioNTech and Dr. Vinod Balachandran, M.D. of Memorial Sloan Kettering Cancer Center, presented preliminary Phase I data of its BNT122, which it is evaluating with Genentech (Roche) in pancreatic cancer.

U.S. Food and Drug Administration staff said on Friday they were concerned about a possible risk of heart inflammation from Novavax Inc.’s vaccine, even as the company’s data showed the vaccine was effective in reducing the risk of mild-to-severe COVID-19.

Moderna Inc. is testing potential vaccines against monkeypox in preclinical trials as the disease spreads in the United States and Europe.

The Omicron variant of the coronavirus does not have a negative effect on cardiovascular health in young adults who have been vaccinated, a small study suggests. Additionally, women should not delay routine mammograms after receiving a COVID-19 mRNA vaccine, experts now say.

Drugmakers Pfizer Inc and BioNTech SE said on May 23 that three doses of their COVID-19 vaccine generated a strong immune response in children under age 5 and was safe and well-tolerated in their clinical trial.