• 1 January 1979
    • journal article
    • research article
    • Vol. 40  (3) , 449-450
Abstract
N-methyl-N''-nitro-N-nitrosoguanidine was used in a modified and improved procedure to obtain streptomycin-dependent mutants of type A P. multocida and type 1 P. haemolytica. The relative virulence of these mutants was determined by mouse inoculation with and without streptomycin.