Recent developments in highly pathogenic avian influenza (HPAI) have been rapid and impactful. Here are four critical points to understand about the current outbreak and why it matters to Americans:

1. New Government Strategy Announced

Last week, the Trump administration announced a significant shift in strategy to combat the virus. The new approach moves away from mass depopulation of poultry houses, which has been the predominant control tactic, to enhanced biosecurity measures and targeted medications for birds. This change aims to mitigate the economic and emotional impact on farmers while still effectively managing the disease.

2. Poultry Industry Split on Vaccinations

At a recent meeting with Sen. Dave McCormick, R-Pa., Pennsylvania poultry leaders, primarily from the egg-laying business, appealed for a new national approach that includes vaccinations. Egg-laying farms have been particularly hard hit by H5N1, with over 77% of H5N1 cases in poultry since 2022 reported in layer operations, including breeders and pullets.

“It’s the worst it’s ever been. It’s never been this bad. Even back into the 1980s, it’s never been like this,” said Byron Shaffer, director of food safety and quality assurance at Kreider Farms, which was the state’s first farm to test positive for H5N1 in 2022.

“This is a big problem as it exists, but my takeaway, is it could get a lot worse,” McCormick said after the meeting.

The poultry industry is divided on the issue of vaccinations. The United Egg Producers has urged the USDA to proceed with stockpiling vaccines and to begin clinical trials of a vaccine for poultry. They also advocate for alternative vaccine delivery methods other than injections.

However, the National Chicken Council, representing broiler operations, opposes vaccinations largely due to export concerns. Tom Super, the council’s spokesman, wrote in an email that most countries, including the U.S., do not recognize countries that vaccinate as free of HPAI. This is because vaccines can mask the presence of the disease, leading to import restrictions.

“The U.S. broiler industry is the second-largest exporter of chicken in the world, exporting about 16% of our chicken meat production valued at more than $5 billion annually,” Super said. “If we start vaccinating for HPAI in the U.S., regardless of what poultry sector vaccinates, the broiler industry will lose our ability to export, which will cost the industry and the U.S. economy billions and billions of dollars every year.”

Until there are written assurances and trade protections in place with trading partners, and the definition of ‘poultry’ is changed by the World Organization for Animal Health, the National Chicken Council will continue to oppose vaccination for HPAI. They currently support the USDA’s ‘stamping out’ policy to eradicate the virus.

3. Cows Test Positive for Wild Bird Strain

The USDA recently confirmed that the H5N1 D1.1 strain, the dominant strain found in wild birds, was detected on dairy farms in Nevada and Arizona. This is a significant development because previous strains were the B3.13 genotype. There is concern that in states like Pennsylvania, which have large numbers of poultry and dairy farms, this could make transmission to dairy farms easier.

A follow-up report by the Center for Infectious Disease Research and Policy at the University of Minnesota stated that detections of the new genotype came from milk testing, and that clinical signs in the cows didn’t develop until after the detections. Farmers in Nevada also reported large wild bird die-offs near their facilities where positives came back.

On Feb. 13, the USDA confirmed the D1.1 strain on a dairy farm in Arizona. This confirmation was a result of state tracing and investigation. According to a press release, whole-genome sequencing showed the detection as a separate wild bird introduction of H5N1 to dairy cattle and is now the third identified spillover event into dairy cattle. This finding may indicate an increased risk of H5N1 introduction into dairies through wild bird exposure.

4. Current Numbers Reported

More than 754 commercial poultry flocks have tested positive for H5N1 since the outbreak began in 2022, affecting 162 million birds. Over the past 30 days, there have been 102 commercial poultry flocks affected by HPAI, accounting for 23.33 million birds. However, the last official case confirmed by the USDA was on Feb. 14, and there is usually a lag between states reporting a case and USDA confirmation, so the official number is likely higher.

On dairy farms, 972 cases of the virus have been reported in 17 states. Over the past 30 days, 36 new cases of H5N1 in dairy cows have been reported, including the first cases in Nevada and Arizona. Similar to poultry, there is usually a lag between states reporting a case and USDA confirmation, so the official number is also likely higher.

Additional Insights and Practical Applications

The ongoing HPAI outbreak highlights the need for a comprehensive and coordinated response from both the government and the poultry industry. The shift in strategy towards enhanced biosecurity and targeted medications is a step in the right direction, but it must be supported by robust data collection and analysis to ensure its effectiveness.

The debate over vaccinations underscores the complex interplay between public health, economic interests, and international trade. While vaccinations could potentially protect poultry and reduce the economic impact, the concerns about export restrictions and the potential masking of the disease are valid. A balanced approach that includes both vaccinations and stringent biosecurity measures may be necessary.

The detection of H5N1 in dairy cattle is a worrying development that requires immediate attention. Enhanced surveillance and biosecurity measures on dairy farms, particularly in areas with high poultry densities, are crucial to prevent further spread. Farmers should be educated on the importance of biosecurity practices and the potential risks associated with wild bird exposure.

As the outbreak continues, it is essential for the USDA and other relevant agencies to provide timely and accurate information to the public. Transparency and clear communication can help build trust and ensure that the public is well-informed about the risks and the measures being taken to mitigate them.