Doctors nationwide are encountering more children with whooping cough, bacterial infections and other serious illnesses, as well as more adults refusing tetanus shots.

Experts say A.I. tools have made it even easier for influencers and others to spread false messages online.

The agency’s scientists and data contractors reviewed millions of patient records for studies that were pulled back before release.

Influencers jumped to fill the information void with conspiracy theories about the attack at the White House Correspondents’ dinner on Saturday.

Vaccine skeptics, ‘organic moms’ and environmental activists came together to elect President Trump. But some voters are disillusioned and might not turn out again.

Ben Riley was already writing about the risks of chatbots when his dad started trusting A.I. over his doctor.

Representative Eric Swalwell, a Washington figure, was largely unknown in the California State Capitol. But influential groups began backing him for governor in the weeks before he was publicly accused of sexual assault.

Ms. Peters, a former county clerk, received a nine-year sentence after being convicted of tampering with voting machines. An appeals court overturned the sentence but did not immediately free her from prison.

Propaganda and disinformation have flooded the internet in a sophisticated effort to undermine support for U.S. and Israeli attacks.

The FX show, which dramatizes the relationship between John F. Kennedy Jr. and Carolyn Bessette, has inspired a legion of younger viewers to dig into the couple’s past and 1990s New York City.

The authorities have made a wave of arrests to stop people posting footage of strikes, citing security risks. Experts also see a fear of damage to the countries’ image as safe havens.

Health Secretary Robert F. Kennedy Jr.’s vaccine skepticism is posing challenges for the Trump administration. Top health jobs are unfilled, and a court has blocked his vaccine schedule changes.

A federal judge halted the Trump administration’s changes to vaccine recommendations, but the mistrust and fear they have stoked may last for years.

Officials say the crippling of the Cybersecurity and Infrastructure Security Agency, which the president himself created, could open elections to cyberattacks and foreign influence.

After the sprawling and chaotic federal immigration crackdown in Minnesota, jurisdictions in other states have been bracing for a range of scenarios.

State media and online propagandists are striking a confident posture, despite heavy losses. Some of the content was generated by artificial intelligence.

As the midterm elections approach, the health secretary is focusing on “real food.” Anger is rising among some of his supporters.

The nearly decade-old conspiracy theory does not align neatly with the facts emerging from the documents. That does not seem to matter.

Key elements of the Trump administration’s arguments this week for another military campaign against Iran do not hold up.

The president appears to be undermining Americans’ faith in the outcome, at a moment when Republicans face an uphill climb to keep control of Congress.

Federal policies under Robert F. Kennedy Jr. that are hostile to vaccines have “sent a chill through the entire industry,” one scientist said.

Proponents of vaccines warn that the efforts will further dismantle the immunization infrastructure and lead to more outbreaks of disease.

The dump of millions of documents has fueled a new wave of speculation, A.I.-generated hoaxes and foreign disinformation.

Even in a government full of conspiracists, Kurt Olsen stands out. He made a key referral in the Fulton County, Ga., election case.

A newly unsealed affidavit showed that a criminal investigation into the 2020 election in Fulton County, Ga., relied heavily on claims about ballots that have been widely debunked.

The comments by the Centers for Medicare and Medicaid Services director come as South Carolina grapples with a large measles outbreak.

One panelist accused the F.D.A. of withholding data on potential harms. The advisers also are reviewing research on vaccines given to pregnant women.