Photo: Sergei Fadeichev\TASS via Getty Images

Scientists at the National Institutes of Health announced the start of the first in-human trial for a universal influenza vaccine on Wednesday, known as H1ssF_3928.

Driving the news: The creation of a universal vaccine has been prioritized by the National Institute of Allergy and Infectious Diseases (NIAID) in part to protect against a pandemic strain that could kill millions like the 1918 flu pandemic. The H1ssF_3928 clinical trial, which will gradually enroll at least 53 adults, is ongoing at the NIH Clinical Center in Bethesda, Maryland.

Go deeper: Pandemic flu is #1 health security concern, per WH official

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Arrest over letter to Trump containing poison ricin

President Trump returning to the White House from Minnesota on Sept. 18. Photo: Win McNamee/Getty Images

A suspect was arrested for allegedly "sending a suspicious letter" after law enforcement agents intercepted an envelope addressed to President Trump containing the poison ricin, the FBI confirmed in an emailed statement to Axios Sunday.

Details: The suspect, a woman, was arrested while trying to enter New York from Canada, law enforcement forces said.

Updated 2 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 7 p.m. ET: 30,881,522 — Total deaths: 958,493— Total recoveries: 21,119,006Map.
  2. U.S.: Total confirmed cases as of 7 p.m. ET: 6,794,479 — Total deaths: 199,469 — Total recoveries: 2,590,671 — Total tests: 95,108,559Map.
  3. Politics: Testing czar on Trump's CDC contradictions: "Everybody is right" Ex-FDA chief: Career scientists won't be "easily cowed" by political vaccine pressure.
  4. Education: What we overlooked in the switch to remote learning.
  5. Health: The dwindling chances of eliminating COVID-19 — 7 states set single-day coronavirus case records last week.
  6. World: England sets £10,000 fine for breaking self-isolation rules — The countries painting their pandemic recoveries green.

Trump campaign goes all in on Pennsylvania

Trump poster in Scranton, Pennsylvania. Photo: Robert Nickelsberg/Getty Images

The president's campaign is placing more importance on Pennsylvania amid growing concern that his chances of clinching Wisconsin are slipping, Trump campaign sources tell Axios.

Driving the news: Pennsylvania, which has 20 electoral votes, twice Wisconsin's number, actually has been trending higher in recent public and internal polling, a welcome development for the campaign.