| Nomination for Nobel Prize in Physiology or Medicine | 
| Year: | 1949 | 
| Number: | 38 - 0 | 
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| Nominee 1: 
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| Name: | Oswald Theodore  Avery | 
| Gender: | M | 
| Year, Birth: | 1877 | 
| Year, Death: | 1955 | 
| Profession: | former dept head | 
| University: | Rockefeller Institute for Medical Research (now  Rockefeller University) | 
| City: | New York | 
| State: | NY | 
| Country: | UNITED STATES (US) | 
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| Nominee 2: 
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| Name: | Michael J Heidelberger | 
| Gender: | M | 
| Year, Birth: | 1888 | 
| Year, Death: | 1991 | 
| Profession: | Professor of biochemistry | 
| Department: | College of Physicians and Surgeons | 
| University: | Columbia University | 
| City: | New York | 
| State: | NY | 
| Country: | UNITED STATES (US) | 
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| Motivation: | Demonstrated that the capsule of pneumococcus is essential for its virulence.
Chemical analysis of the pneumococcus capsule. Work on the tramsmutation of types of pneumococci. | 
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| Nominator: 
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| Name: | W G Smillie | 
| Gender: | M | 
| Profession: | Prof of Public Health and Preventative Medicine | 
| City: | New York | 
| State: | NY | 
| Country: | UNITED STATES (US) | 
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