12M-9-44 CABLE ADDRESS
ROKSTITUTE

THE HOSPITAL OF THE ROCKEFELLER INSTITUTE
FOR MEDICAL RESEARCH
66TH STREET AND YORK AVENUE, NEW YORK 21, N. Y.

November 15, 1946

Dr. Joshua Lederberg

Osborn Botanical Laboratory
Yale University

New Haven, Connecticut

Dear Dr. Lederberg:

I enjoyed your letter of November 12th very much. I have
not been working with the hemophilic bacteria for a number of
years and have no cultures of parainfluenzae or canis. You should
have no trouble in obtaining a culture of canis. Practically all
male dogs have a slight amount of preputial pus. In meny instances
this pus is almost a pure culture of canis.

Now in regard to parainfluenzae. I suggest that you might
get a culture from Dr. Margaret Pittman who did work, the last time
I heard, with the U. S. Public Health Service at Bethesda, Md.
You also might try to get a culture from Dr. Colin MacLeod, Professor
of Bacteriology, New York University Medical School, 477 First Avenue,
New York.

a
I am sorry I cannot be of more help to you.

Sincerely,

oot

Thomas M. Rivers, M. D.

TMR: EH