A genomic analysis indicates that Nigeria’s big Lassa fever outbreak this year has been driven by transmission from rats, not by human-to-human spread, easing worries about a possible Lassa superbug, according to a study described yesterday in the New England Journal of Medicine (NEJM).
Mexico, Belize, and Costa Rica are among the few Americas countries reporting small increases in Zika virus activity, the Pan American Health Organization (PAHO) said in its Aug 25 epidemiologic update.
