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“It’s crucial to understand why measles matters,” said Dr. Kate O’Brien, director of the WHO’s Department of Immunization, Vaccines and Biologicals. “Its high transmissibility means that even small drops in vaccine coverage can trigger outbreaks, like a fire alarm going off when smoke is detected first.”

That is, measles is often the first disease to pop up when vaccination rates overall drop.

"When we see measles cases, it signals that gaps are almost certainly likely for other vaccine-preventable diseases like diphtheria or whooping cough or polio, even though they may not be setting off the fire alarm just yet," O'Brien said at a media briefing Monday, ahead of the release of the WHO's Progress Toward Measles Elimination report, published Friday in its Weekly Epidemiological Record.
“It’s crucial to understand why measles matters,” said Dr. Kate O’Brien, director of the WHO’s Department of Immunization, Vaccines and Biologicals. “Its high transmissibility means that even small drops in vaccine coverage can trigger outbreaks, like a fire alarm going off when smoke is detected first.” That is, measles is often the first disease to pop up when vaccination rates overall drop. "When we see measles cases, it signals that gaps are almost certainly likely for other vaccine-preventable diseases like diphtheria or whooping cough or polio, even though they may not be setting off the fire alarm just yet," O'Brien said at a media briefing Monday, ahead of the release of the WHO's Progress Toward Measles Elimination report, published Friday in its Weekly Epidemiological Record.
Benjamin Sonntag-King and 1 other boosted
“It’s crucial to understand why measles matters,” said Dr. Kate O’Brien, director of the WHO’s Department of Immunization, Vaccines and Biologicals. “Its high transmissibility means that even small drops in vaccine coverage can trigger outbreaks, like a fire alarm going off when smoke is detected first.”

That is, measles is often the first disease to pop up when vaccination rates overall drop.

"When we see measles cases, it signals that gaps are almost certainly likely for other vaccine-preventable diseases like diphtheria or whooping cough or polio, even though they may not be setting off the fire alarm just yet," O'Brien said at a media briefing Monday, ahead of the release of the WHO's Progress Toward Measles Elimination report, published Friday in its Weekly Epidemiological Record.
“It’s crucial to understand why measles matters,” said Dr. Kate O’Brien, director of the WHO’s Department of Immunization, Vaccines and Biologicals. “Its high transmissibility means that even small drops in vaccine coverage can trigger outbreaks, like a fire alarm going off when smoke is detected first.” That is, measles is often the first disease to pop up when vaccination rates overall drop. "When we see measles cases, it signals that gaps are almost certainly likely for other vaccine-preventable diseases like diphtheria or whooping cough or polio, even though they may not be setting off the fire alarm just yet," O'Brien said at a media briefing Monday, ahead of the release of the WHO's Progress Toward Measles Elimination report, published Friday in its Weekly Epidemiological Record.
Ulrike Hahn and 1 other boosted
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Safety Information by Vaccine Common Vaccine Safety
Autism and Vaccines
QUESTIONS AND CONCERNS
PAGE 2 OF 9 | ALL PAGES J
For Everyone
NOV. 19, 2025
KEY POINTS
• The claim "vaccines do not cause autism" is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism.
• Studies supporting a link have been ignored by health authorities.
• HHS has launched a comprehensive assessment of the causes of autism, including investigations on plausible biologic mechanisms and potential causal links.
An official website of the United States government Here's how you know v CDC Safety Information by Vaccine Common Vaccine Safety Autism and Vaccines QUESTIONS AND CONCERNS PAGE 2 OF 9 | ALL PAGES J For Everyone NOV. 19, 2025 KEY POINTS • The claim "vaccines do not cause autism" is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism. • Studies supporting a link have been ignored by health authorities. • HHS has launched a comprehensive assessment of the causes of autism, including investigations on plausible biologic mechanisms and potential causal links.
An official website of the United States government

Autism and Vaccines

QUESTIONS AND CONCERNS
PAGE 2 OF 9 | ALL PAGES J
For Everyone
NOV. 19, 2025

KEY POINTS
• The claim "vaccines do not cause autism" is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism.
• Studies supporting a link have been ignored by health authorities.
• HHS has launched a comprehensive assessment of the causes of autism, including investigations on plausible biologic mechanisms and potential causal links.
An official website of the United States government Autism and Vaccines QUESTIONS AND CONCERNS PAGE 2 OF 9 | ALL PAGES J For Everyone NOV. 19, 2025 KEY POINTS • The claim "vaccines do not cause autism" is not an evidence-based claim because studies have not ruled out the possibility that infant vaccines cause autism. • Studies supporting a link have been ignored by health authorities. • HHS has launched a comprehensive assessment of the causes of autism, including investigations on plausible biologic mechanisms and potential causal links.