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RFK, Jr.–backed Lyme disease conspiracy theory may be probed

By Scientific American  
   December 17, 2025

President Donald Trump is expected to sign a defense bill this week that orders a government watchdog to probe a conspiracy theory—promoted by HHS Secretary Robert F. Kennedy, Jr. — that the U.S. military bioengineered Lyme disease. Despite this established pathway for the disease, Kennedy has promoted the conspiracy theory that Lyme was bioengineered; on a 2024 podcast, he mused that the condition 'is highly likely to have been a military weapon.'

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