Austin Public Health says about a week and-a-half ago, the group comprised of approximately 70 adults in their 20s left for a spring break trip to Cabo San Lucas, Mexico. Currently, 28 of the 70 have tested positive for COVID-19, and more of them are under public health investigation. The University of Texas at Austin confirmed “many of those involved” were UT Austin students.
Not sure “adults” is the word I would use.