Shots from CSL Seqirus and GSK are among those being considered.
Officials in the United States, Canada, and Europe are considering the vaccination of workers and others against the highly pathogenic avian influenza.
The U.S. government is “looking closely” at the possibility of vaccinating farm workers and others in close contact with the virus, according to Dawn O’Connell, the assistant secretary for preparedness and response at the U.S. Administration for Strategic Preparedness and Response.
Angela Rasmussen, a virologist at the University of Saskatchewan, said she has been in discussions with U.S. and Canadian officials about using vaccines to protect workers after the influenza, or bird flu, jumped from birds to cattle.
The first cases of H5N1, a strain of the flu, in cattle were detected earlier this year, although some scientists say available evidence points to the cases cropping up in late 2023.
Discussions about using vaccines to try to prevent a pandemic are ongoing at the government level and among scientists in several places, including the UK, said Wendy Barclay, chair in influenza virology at University College London, who also researches avian flu for the UK Health Security Agency.
The UK government did not comment but said it is monitoring the situation in the United States.
In the European Union, the European Commission’s Health Emergency Preparedness and Response Authority is working on a joint procurement of CSL Seqirus’s vaccine to “potentially prevent a pandemic” sparked by individuals exposed to infected birds and animals, spokesman Stefan De Keersmaecker said.
A spokeswoman for CSL, which has contracts for pandemic influenza vaccines with 30 governments, said the company has been in talks with several governments about procuring vaccines since 2022.
The U.S. Food and Drug Administration approved a CSL influenza A vaccine in 2020, based largely on immunogenicity and safety results from a small clinical trial of 319 people.
Dr. Peter McCullough, an epidemiologist based in Texas, said on the social media platform X that without larger trials, it’s not possible to know whether the vaccine is safe or effective in humans.
