A newly developed messenger RNA vaccine is the first such approach to elicit acquired resistance against the tick Ixodes scapularis and prevent it from transmitting the Lyme disease vector Borrelia burgdorferi in guinea pigs, according to a U.S. study led by researchers at Yale University School of Medicine in New Haven, Conn.

Investigators from the Ragon Institute of MGH, MIT and Harvard have reported new details on a so-called exceptional elite controller, a patient who has rid herself of an HIV infection.