Our reporters share a compendium of debuts, discoveries and (sometimes overdue) appearances in the paper.

© The New York Times

Vaccine safety experts say more research into the side effects would be welcome yet question whether the health secretary’s effort will be grounded in science.

© Tierney L. Cross/The New York Times

The spread of measles in Pennsylvania and Ohio is largely affecting Amish communities where vaccinations levels are low.

© Madeleine Hordinski for The New York Times