Guests dance to DJ music in March 2020. Photo: Sean Drakes/Getty Images

64 college-aged people who were on a spring break trip to Cabo San Lucas, Mexico in late March contracted COVID-19, with one-fifth showing symptoms, a Wednesday case study from the Centers for Disease Control and Prevention shows.

Why it matters: The report reveals how universities that are planning to reopen this fall must prepare for clusters of cases that could easily spread among groups of young, healthy students.

The big picture: Young people can contract and spread the coronavirus with mild to no symptoms, endangering more vulnerable populations when they travel or do not seriously practice social distancing measures.

  • In March, a University of Texas at Austin student tested positive for the coronavirus with cough, sore throat and shortness of breath, followed by two other positive cases.
  • Contact tracers found the students were a part of a cluster of 64 positive cases (28%) out of 183 travelers that returned from a spring break trip the week before.
  • Several other cases were from students' roommates and their community.

What to watch: Outbreaks could occur on college campuses in the fall if good contact tracing resources are not implemented to track and isolate people, the CDC warns.

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World coronavirus updates

Data: The Center for Systems Science and Engineering at Johns Hopkins; Map: Axios Visuals

While several novel coronavirus vaccines are in late-stage trials, World Health Organization Director-General Tedros Adhanom Ghebreyesus warned on Monday: "There is no silver bullet at the moment, and there might never be."

What he's saying: "For now, stopping outbreaks comes down the the basis of public health and disease control," Tedros said. Testing, isolating and treating patients and tracing and quarantining their contacts."

Robert O'Brien tests positive for coronavirus

Photo: Saul Loeb/AFP via Getty Images

President Trump's national security adviser Robert O'Brien tested positive for the coronavirus, Bloomberg first reported.

Why it matters: O'Brien, who is isolating at home and working remotely, is the closest official to Trump to test positive thus far.

Jul 27, 2020 - Health

Miami Marlins cancel home opener as team coronavirus outbreak spreads

Photo: Mark Brown/Getty Images

The Miami Marlins' home opener on Monday night against the Baltimore Orioles was canceled after eight more players and two coaches tested positive for the coronavirus, ESPN reports.

Why it matters: It highlights the difficulty of carrying out a sports season as the nation's virus caseload continues to grow. The MLB chose to allow teams to travel around the country, opting out of the "bubble" environment that other leagues have favored.