MBL/Woods Hole, Mass.
August 24, 1954

Dr. We R. Bailey

Enteric Laboratory

Laboratory of Hygiene

Dept. National Health end Welfare
Ottawa, Canada

My dear Bailey:
I am happy to reply to yours of the 17th.

Boulgakov is located at the “Institut de Bacteriophage (d'ierelle)"
in Paris; I can send you a more complete address, if you wish, when I return
to Hadism. Sertic has not been heard from for at least 15 years, is pre-
sumed dead.

On our request for flageller-specific phages, Boulgakev sent us VIII~-113
and another. The latter proved, however, to be an ordinary O-specific phage;
the former indiscriminately lyses a mmber of different serotypos, but only
Plagellated forms, and has been useful in the selection of O-varlants. I do
not believe that any phages exist that are specific for H-antigon "ad". (Felix!
co nent on this somewhere was based on a misreading of the papers, as far as
I Imow.) At any rate, the only flagellar phage that seems to be carried in
stock anywhere is the VIII~113.

I will be happy to send you a sanple of this when T get hack to Madienn.
Ae I may be quite busy, please allow me two or three weeks. I will also send
you Boulgakev's full address. If I can help in any other way. Dlease let me know.

For our own investigations, I would be grateful to haw (eventually) any
additional, reasonably stable non-flagellated mutants that, may turn up, preferably.
in 5. typhimurium, but acceptably in other group B or D. Would you keep this
in mind’ Unfortunately, the flagellar phage does not attack more than a small
fraction of mokile types, and often leaves resistant survivors only a few of
which are stable non-flagellated mutants.

> yours sincerely,

\ f Peo sy
bey “* a ;

fhtagt? a é ty baad
{Joshua Lederberg a
Professor #f Genoti dd