Bernard Roizman, Virologist Who Demystified Herpes, Dies at 96
He mapped the herpes simplex virus genome, revealing how it invades cells. His work also helped lay the groundwork for potential vaccines and gene therapies.

Β© Amir Hamja for The New York Times

Leishmania parasites appear to evolve through widespread genetic exchange, reshaping assumptions about how they adapt and spread. A parasite long thought to spread mostly by cloning itself may be far more genetically dynamic than scientists once believed. A new international study suggests that Leishmaniaβa group of microscopic parasites responsible for debilitating tropical diseasesβregularly swaps genetic [...]