Becoming the second approved respiratory syncytial virus (RSV) vaccine for the 60 and older crowd, Pfizer Inc.’s Abrysvo (RSVpreF; PF-06928316) received a U.S. FDA nod on May 31 for RSV lower respiratory tract disease. In February, the agency’s Vaccines and Related Biological Products Advisory Committee voted 7-4 that data support both the safety and efficacy of the vaccine. Behind this approval for the senior population is another potential approval, expected in August, for infants via maternal inoculation.

Snipr Biome ApS has published initial clinical data showing its Crispr-Cas modified bacteriophage product selectively kills Escherichia coli – including strains that are resistant to antibiotics – with no effect on the rest of the gut microbiome. That paves the way to test Snipr-001 in the prevention of bloodstream infections in hematological cancer patients who, as a result of increased intestinal permeability caused by chemotherapy, are at high risk of gut bacteria getting into the bloodstream.

Aridis Pharmaceuticals Inc. has taken a few knocks in the past year but its new agreement with the U.S. FDA is giving it an opportunity to move forward. The company’s stock (NASDAQ:ARDS) rose 115% on May 31 to close at 39 cents per share as the company and agency agreed on the design of a single confirmatory phase III superiority study of AR-301 (tosatoxumab), an adjunctive therapy for treating pneumonia caused by gram-positive bacteria Staphylococcus aureus in mechanically ventilated hospitalized patients.

A week ahead of its May 29 PDUFA date, the U.S. FDA has approved Xacduro (sulbactam for injection; durlobactam for injection) for treating one of the toughest and most deadly infections, carbapenem-resistant Acinetobacter baumannii, in adults.

With GSK plc’s Arexvy approved in the U.S. as the first respiratory syncytial virus (RSV) vaccine, several other developers are lining up for what in five years could be a $10 billion market. Their aim is to provide lasting protection for those most susceptible to the endemic virus, particularly young children and those older than 60. Behind GSK is Pfizer Inc. with PF-06928316, which has a U.S. FDA PDUFA date set for this month, and Sanofi SA’s nirsevimab, for which FDA action is expected in the third quarter.

The U.S. FDA has approved the country’s first-ever respiratory syncytial virus (RSV) vaccine, Arexvy, from GSK plc. The adjuvanted vaccine is also the first for older adults anywhere on the planet. GSK now has a head start to vaccinate the U.S. market, but other big companies, such as Sanofi SA and especially Pfizer Inc., are in late-stage development and will pose strong challenges in the coming year. Pfizer’s PF-0692831/RSVpreF, an RSV vaccine for treating lower respiratory tract disease caused by RSV, has a priority BLA with a May 31 PDUFA date.