. . "2011-03-14Z"^^ . . . "Leslie Harold Collier (9 February 1921 \u2013 14 March 2011) was a scientist responsible for developing a freeze-drying method to produce a more heat stable smallpox vaccine in the late 1940s. Collier added a key component, peptone, a soluble protein, to the process. This protected the virus, enabling the production of a heat-stable vaccine in powdered form."@en . "British virologist" . "1921Z"^^ . . "2011Z"^^ . "Leslie Harold Collier"@en . "Collier, Leslie H."@en . . "1921-02-09Z"^^ . . . .