FEDERAL SECURITY AGENCY

PUBLIC HEALTH SERVICE
WASHINGTON 25, D.C.

 

IN REPLYING, ADDRESS THE
PUBLIC HEALTH SERVICE

REFER TO:
Tuberculosis Research Laboratory,
411 East 69th St., New York 21, N. Y.

December 12, 1951.

Dr. Joshua Lederberg,
Department of Genetics,

The University of Wisconsin,
College of Apriculture,
Madison 6, Wisconsin.

Dear Joshua:

I thought you might be interested in the
enclosed,

We find that Salmonella SW-38, ir addition
to its aromatic requirement, also has a pretty good
requirement for niacin.

Sincerely yours,
Sv
(7 2yeeee
Bernard D. Davis

BDD/h1

ence