Abstract
Footpads of mice sensitized by oil-treated Bacillus Calmette-Guérin (BCG) cell walls given either intravenously, subcutaneously, intradermally, intraperitoneally, or intramuscularly became swollen and reddened after injection of purified protein derivative (PPD). This reaction, greatest after intradermal and subcutaneous sensitization, generally reached a maximum about 24 hr after challenge and was still marked at 48 hr. The histological response was characterized by infiltration with both polymorphonuclear and mononuclear cells. The proportion of mononuclear cells increased with time and they predominated at 48 hr. The footpad reaction could be detected as early as 1 week after sensitization and persisted for at least 37 weeks. Footpad sensitivity to PPD and acquired resistance to airborne infection with Mycobacterium tuberculosis H37Rv were correlated in that (i) both reached a peak approximately 1 month after sensitization of the mouse, and (ii) cell walls treated with NaOH or given without oil neither protected mice against challenge infection nor sensitized them to PPD. Although, as we reported previously, mice vaccinated subcutaneously or intradermally exhibited little or no enhanced resistance to experimental infection, mice given oil-treated cell walls by these routes were highly sensitive to footpad inoculation of PPD. Therefore, the footpad test cannot be used to determine immunity of the mouse to pulmonary infection with tubercle bacilli.
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