The Delta variant of COVID-19 has spawned a new, troubling variant known as Delta-plus that has been identified for the first time in Louisiana, according to officials at Ochsner Health. Delta-plus is thought to have the same higher rate of transmission as the Delta variant, which was originally identified in India and is about two times as infectious as the original coronavirus strain. But it also has a characteristic of variants from South Africa and Brazil that makes it harder for antibodies to block it from entering cells. “It gives you a double whammy,” said Dr. Lucio Miele, who has...