Published in Medical Letter on the CDC and FDA, January 29th, 2006
"Francisella tularensis subspecies tularensis (type A) strain SCHU S4 is a prototypic strain of the pathogen that is highly virulent for humans and other mammals. Its intradermal (i.d.) 50% lethal dose (LD50 ) for mice is <10 CFU. We discovered a spontaneous mutant, designated FSC043, of SCHU S4 with an i.d. LD50 of >108 CFU. FSC043 effectively vaccinated mice against challenge with a highly virulent type A strain, and the protective efficacy was...
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