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Competitive infection of susceptible mice (BALB/c) with an equal mixture of either DT2 or DT99 pigeon isolates and virulent serotype Typhimurium AJB715. Bacteria from spleens of infected mice were enumerated. Three to four mice were used per pigeon isolate used. Values are expressed as log AJB715 per pigeon isolate, and error bars represent standard error. The asterisk indicates a significant difference from inoculum using Student's t test, with a P value of <0.05.
