US Secretary of Health and Human Services Robert F. Kennedy Jr. speaks before President Donald Trump signs an executive order calling for more research and flexibility on vaccines, in the Oval Office of the White House in Washington, DC, on August 10, 2026. (Photo by Jim WATSON / AFP via Getty Images)

WASHINGTON, DC - AUGUST 10: A poster that reads Gold Standard Childhood Vaccine Recommendations" is visible before U.S. President Donald Trump signs an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. (Photo by Anna Moneymaker/Getty Images)

WASHINGTON, DC - AUGUST 10: U.S. President Donald Trump (C) reaches out to shake hands with Health and Human Services Secretary Robert F. Kennedy Jr. before signing an executive order calling for childhood vaccine shots to be spaced out into separate visits during an event in the Oval Office of the White House on August 10, 2026 in Washington, DC. During his second term, Trump has urged Health and Human Services Secretary Robert F. Kennedy Jr. to investigate further research on vaccines. Also pictured is National Institutes of Health Director Jay Bhattacharya (L), and Jayme Leagh Franklin with the The Conservateur (2nd-L). (Photo by Anna Moneymaker/Getty Images)

US Secretary of Health and Human Services Robert F. Kennedy Jr. speaks before President Donald Trump signs an executive order calling for more research and flexibility on vaccines, in the Oval Office of the White House in Washington, DC, on August 10, 2026. (Photo by Jim WATSON / AFP via Getty Images)

US Secretary of Health and Human Services Robert F. Kennedy Jr. (R) speaks before President Donald Trump signs an executive order calling for more research and flexibility on vaccines, in the Oval Office of the White House in Washington, DC, on August 10, 2026. (Photo by Jim WATSON / AFP via Getty Images)

US Secretary of Health and Human Services Robert F. Kennedy Jr. (R) looks on as President Donald Trump speaks before signing an executive order calling for more research and flexibility on vaccines, in the Oval Office of the White House in Washington, DC, on August 10, 2026. (Photo by Jim WATSON / AFP via Getty Images)

US Secretary of Health and Human Services Robert F. Kennedy Jr. (R) looks on as President Donald Trump speaks before signing an executive order calling for more research and flexibility on vaccines, in the Oval Office of the White House in Washington, DC, on August 10, 2026. (Photo by Jim WATSON / AFP via Getty Images)

US Secretary of Health and Human Services Robert F. Kennedy Jr. (R) looks on as President Donald Trump speaks before signing an executive order calling for more research and flexibility on vaccines, in the Oval Office of the White House in Washington, DC, on August 10, 2026. (Photo by Jim WATSON / AFP via Getty Images)