Update: Following publication, UT confirmed the patients are university students.

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Twenty-eight "spring breakers" have tested positive for COVID-19 after returning home from a trip to Cabo San Lucas, Mexico.

Austin Public Health announced on Tuesday, March 31, that an investigation is underway after 70 people, identified as being in their 20s, took a chartered a plane to Cabo 10 days ago. Some of those travelers returned to Austin on commercial flights, says an APH alert.

Of those patients testing positive, four showed no symptoms. All those who have tested positive are in self-isolation. The remaining travelers are being quarantined and monitored for symptoms.

Austin Public Health did not identify any of the patients but did say APH, along with UT Health Austin and University Health Services, are monitoring all 70 travelers. UT Health Austin is the clinical practice of the Dell Medical School at the University of Texas at Austin, and UHS is UT's student healthcare provider.

"While Mexico at the time of their travel was not under a federal travel advisory, Austin-Travis County residents should follow CDC’s travel recommendations indicating travelers avoid all non-essential international travel," notes the APH release. "A leisure vacation of any kind is not considered essential."

According to the timeline provided, the vacation happened after key events in the spread of the novel coronavirus, including the extension of spring break for area universities and the cancellation of SXSW, but before Austin's Stay Home/Work Smart order was issued.

The Department of State Health Services has been notified, says APH.