JSKB/MB.

Dr. BeA-D. Stocker, 4th November 1952.
London Schoql of Hygiene and
Tropical Medicine,
Keppel street,
Gower Street, W.C. Le

 

Dear Stocker,

The symbiotic bacteriophages which I have found in
the strains of Salmonells typhi-mmrium you gent to me are as
follows :-

Strain LT2 (Lilleengen NOs 85 } Bs

Strain LT7 (Lilleengen No.578) Be and B4

Strain LTZ2 (Lilleengen No.409) 42 and B4
It is possible that LT2 also contains Be but I have not yst been
successful in separating it from the B4. The B2 in this strain
appears og occasional plaques in high concentrations, whilst the
B4 miltiplies freely and predominates.

I have come to the conclusion that B4 is a group and
not an entity. This particular B4 differs in some minor details
from the type strain.

tT have isolated all these phages in pure culture and
can let you have some if you want it. ,

Yours sincerely,

i ly any