GSK, Sanofi and CSL Ltd have secured $72 million from the US government to ramp up production of bird flu vaccines, Reuters reported, citing a health official on Friday during a press briefing.

The move comes as a multi-state outbreak among livestock and poultry has caused human illnesses and infected more than 254 herds in 14 states since March, according to government data.

The companies will use the funds to fill vials and pre-filled syringes so that doses can be ready to distribute if needed, said David Boucher, director of Infectious Disease Preparedness and Response for the US Department of Health and Human Services.

The latest award includes $37.9 million for CSL, $23.4 million for Sanofi and $10.5 million for GSK.

It would more than double the country's supply of shots targeting bird flu, raising the country's total supply of ready-to-use doses to 10 million within the first quarter of 2025.

GSK, Sanofi and CSL will also make additional bulk vaccine ingredients matched to circulating strains of bird flu, Boucher said.

Australia's CSL recently secured a contract worth $121.4 million to increase the US government's stockpile for bird flu vaccines to 40 million doses.

CSL and GSK did not immediately respond to a Reuters request for comment. Sanofi redirected Reuters to the Biomedical Advanced Research and Development Authority, a part of HHS that issued the reward.