Worries over the Delta variant causing a spike in testing center wait times Worries over the delta variant causing a spike in testing center wait times and last updated 2021-07-26 19:52:13-04 CORPUS CHRISTI, Texas â The line for the COVID-19 testing site on the corner of South Padre Island Dr. and Airline was wrapped around the building for most of the day. The long line even disrupted traffic in the area at times. Seeing the increase in wait times has concerned a few locals. âI think itâs really scary that all of this is ramping up again and the kids are about to start school⦠thatâs what worries me the most,â says Kelli Maxwell.