Texans hit hardest by coronavirus are facing another challenge: the pause on the J&J vaccine Karen Brooks Harper and Mandi Cai, The Texas Tribune April 15, 2021 FacebookTwitterEmail A person getting the COVID-19 vaccine passes a sign that says “Johnson & Johnson vaccine only.” Most health agencies nationwide have paused use of the one-shot Johnson & Johnson/Janssen vaccine while federal agencies examine a possible rare side effect that can cause blood clots.Damian Dovarganes | AP Today was the day that hundreds of college students at Texas Tech University and up to 1,500 others in Lubbock, one of last year’s coronavirus hot spots, were going to be fully vaccinated against COVID-19.