August 24, 1953

Dear Bill:

Eather and I just got back from San Francisco (S.A.B.) and found your note
and cultures waiting here for us. It does indeed look as if there is no corre-
lation between the host range and the schematig antigens. Have you tried anti-phage
serum to further check on these heterologous reactions?

I probably mentioned before that kunzendorf 302-50 is also susceptible to PLT-22,
but I have not been able to grow the phage to a dec titer on this host, so far.
On closer reading cf Pelix' papers, I see that PLT-22 1s essentially one of the TM
or PB "0" phages, and not particularly pertinent to ing. Have E aot sent you
PLT~225?—- my memory on this is cloudy. If you do the occasion to test 22
against miscellansous Salmonellas, the logiéal-crosann specially informative.

&

I am willing tod agree that the serolo peac tions of 302-50 are
insignificant.

Thanxs for these cultures. It will
order, as moat people are vacatio e
any results.

S, ~
a few weeks before the lab. is in running
auperating, but I'll write you again of

   

Sincerely,

Joshua Lederberk