Source-nbcnews.com
Finland has initiated a bird flu vaccination program for farmworkers, sparking debate among U.S. veterinarians and researchers. As bird flu continues to spread among dairy cattle in the U.S., experts are questioning why a similar preventive measure is not being implemented domestically. According to Kay Russo, a livestock and poultry veterinarian in Fort Collins, Colorado, “Farmworkers, veterinarians, and producers handle large volumes of milk that can contain high levels of bird flu virus. If a vaccine seems to provide some immunity, I think it should be offered to them.”
This sentiment is echoed by a majority of the virology and outbreak experts interviewed by KFF Health News. They argue that vaccination should be considered for individuals working closely with dairy cows, as the disease has a high mortality rate globally and the potential for pandemic spread. However, some researchers align with the Centers for Disease Control and Prevention (CDC) in recommending against immediate vaccination. They cite a lack of evidence that this year’s bird flu virus is transmissible between humans or causes severe disease in people.
Debate Over Vaccination and Testing in the U.S.
The wait-and-see approach adopted by the CDC is viewed by some experts as a risky gamble. Jennifer Nuzzo, director of the Pandemic Center at Brown University, emphasized that waiting for severe outcomes indicates widespread infection. Nahid Bhadelia, director of the Boston University Center on Emerging Infectious Diseases, insists that now is the time to offer vaccines to U.S. farmworkers. She also highlights the urgent need for more comprehensive testing of farmworkers and cows to detect and study the H5N1 bird flu virus before it establishes itself on farms and becomes a constant pandemic threat.
Demetre Daskalakis, director of the CDC’s National Center for Immunization and Respiratory Diseases, stated that while the agency takes bird flu seriously and is stockpiling 4.8 million vaccine doses, there is no current recommendation to launch a vaccination campaign. The decision hinges on the risk-benefit ratio, which remains unclear due to insufficient testing. So far, only four mild cases have been reported in the U.S., making it difficult to draw concrete conclusions.
Historical Context and Future Considerations
The debate over bird flu vaccination in the U.S. draws parallels to the 1976 swine flu outbreak, where a rapid vaccination campaign was initiated, only to find that the swine flu cases were mild, and the vaccine posed unnecessary risks. This historical precedent serves as a cautionary tale about responding prematurely to uncertain public health threats. Paul Offit, a virologist at the Children’s Hospital of Philadelphia, supports the CDC’s cautious approach, suggesting more data is needed before a vaccination program is launched.
However, other researchers argue that the current situation is not comparable to 1976. They advocate for a voluntary bird flu vaccination program for a limited number of individuals in close contact with livestock, rather than a widespread campaign. This targeted approach minimizes the risk of rare adverse effects. The bird flu vaccine available, manufactured by CSL Seqirus, was authorized last year by the European equivalent of the FDA, though it has yet to receive FDA approval in the U.S.
As the bird flu virus shows signs of potentially spreading between humans, the debate continues over the best preventive measures. The U.S. must weigh the benefits of early vaccination against the risks and historical lessons, ensuring that any response is based on solid evidence and careful consideration of public health impacts.
