Are we facing a less effective flu shot next year? It's a concerning question, and the answer might surprise you. The ability to accurately predict and combat the flu hinges on global cooperation and data sharing, but recent events are putting this crucial process at risk. Let's dive in.
Typically, the U.S. Centers for Disease Control and Prevention (CDC) receives thousands of influenza samples annually from around the world. These samples are the lifeblood of understanding how the flu virus evolves, and they're essential for the World Health Organization (WHO) to design the next flu vaccine.
But here's where it gets controversial: According to Demetre Daskalakis, who recently resigned from his position leading the National Center for Immunization and Respiratory Diseases at the CDC, the flow of this vital data has drastically slowed down. From February to July, the CDC received a staggering 60% fewer samples compared to the same period last year. The number of countries sending samples also plummeted by 65%. The CDC has not commented on the matter.
This decline in data is a major concern. As Daniel Jernigan, former director of the CDC's National Center for Emerging and Zoonotic infectious diseases, puts it, "When those viruses are not coming in, we don't know what to put in the vaccine, and you're going to have less effective vaccines."
A Patchier Picture:
Seven labs worldwide, including the CDC, form a network of WHO collaborating centers. They analyze the virus samples sent from National Influenza Centers in over 150 countries. However, shipments to this network are also down this year, according to Maria Van Kerkhove, interim director of the department of epidemic and pandemic threat management at WHO.
But the situation is more complex. WHO typically funds the shipment of many of these samples. However, after President Trump withdrew the U.S. from the organization, accusing it of being controlled by China, the organization's budget was reduced by roughly a billion dollars. As a result, the fund to pay for shipments shrank. WHO is working to find other funding, but the impact is already being felt. Kanta Subbarao, a flu researcher at Laval University, highlights the significance: "A reduction in the ability of national influenza centers to share samples will be a huge blow to influenza surveillance."
Less Data, Less Effective Vaccine:
Every year, scientists from the WHO collaborating centers meet to decide which influenza strains the next flu shot should target. This decision-making process is critical. Subbarao explains, "Because we can't predict exactly which virus will dominate in the next season, the vaccine contains multiple strains to try to protect the population against what will come."
Scientists use sophisticated labs, like the CDC, to analyze these viruses. They sequence them and conduct tests to assess their pandemic potential. Fewer samples make these analyses harder. Arnold Monto, an epidemiologist at the University of Michigan, states that it reduces the amount of data available for making these critical decisions.
The Road Ahead:
While there's still time for countries to send in more samples before the February meeting, the slowdown at the CDC could be harder to reverse. Daskalakis worries that countries may be hesitant to share data with the U.S. after its withdrawal from WHO.
Pandemic Preparedness at Risk:
If the CDC becomes increasingly out of the loop, Daskalakis believes the U.S. will be less prepared for a potential flu pandemic. The CDC usually receives about a dozen "candidate vaccine viruses" from the WHO network, which serve as the raw material for mass-producing flu vaccines. However, by the time Daskalakis left the CDC, they had received only two. This could hinder the ability to scale up a response to a flu outbreak.
This also makes it harder for the agency to find concerning variants of any virus that might spark the next big outbreak. As Daskalakis learned during the COVID-19 pandemic, every day of delay can cost lives.
What do you think? Do you believe the decrease in data sharing will significantly impact the effectiveness of future flu vaccines? Are you concerned about the U.S.'s role in global health surveillance? Share your thoughts in the comments below!
