| Date | Text | |
|---|---|---|
15 Jul 1900
Thomas Francis Jr. |
birth Thomas Francis Jr. Born 15 Jul 1900; died 1 Oct 1969 at age 69. American physician, physician, virologist and epidemiologist who was the first in the U.S. to isolate the virus influenza A (1934) and showed that there are other strains, such as influenza B (1940). Francis developed a polyvalent vaccine effective against both strains and conducted research that led to the development of antiserums for the treatment of pneumonia. In 1953, he was asked to design, supervise, and evaluate the field trials of the polio vaccine developed by his former protegé, Jonas Salk. The trials were of unprecedented scope and magnitude, involving about 1.8 million children from across the U.S., Canada, and Finland. On 12 Apr 1955, Francis announced that the Salk vaccine was indeed "safe, effective, and potent." |
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