A pig kidney has been transplanted into a person for the first time without causing rapid rejection by the recipient's immune system, a potentially significant development that might ultimately help ease a critical scarcity of human organs for transplant.
The operation was performed at NYU Langone Health in New York City and entailed the use of a pig whose genes had been changed such that its tissues no longer carried a chemical known to induce an almost instantaneous rejection.
Pediatric researchers are investigating whether Covid-19 is becoming more severe for children now that variants are causing localized flare-ups, even as U.S. cases overall decline.