Purnell Choppin, 91, Dies; Researcher Laid Groundwork for Pandemic Fight

He explored how viruses multiply. An accomplished administrator, he also turned the Howard Hughes Medical Institute into a global biomedical powerhouse.

Purnell Choppin, 91, Dies; Researcher Laid Groundwork for Pandemic Fight
He explored how viruses multiply. An accomplished administrator, he also turned the Howard Hughes Medical Institute into a global biomedical powerhouse.