The Delta variant of the coronavirus is spreading rapidly, especially in southern parts of the country.

Dr James Lawler, with the University of Nebraska Medical Center, says they are still trying to understand why Delta transmits so quickly..

Lawler says there are several reasons why younger people are catching the virus..

Lawler says he is concerned about the rapid spread of Delta…

Lawler says the concern is that more variants will come from unvaccinated people that catch it.