Abstract
Doherty, T. M., and Coffman, R. L. 1996.Leishmania major:Effect of infectious dose on T cell subset development in BALB/c mice.Experimental Parasitology84,124–135.Leishmania major,the causative agent of cutaneous leishmaniasis in humans, causes either a local cutaneous lesion or a fatal, disseminated infection in different strains of mice. It has been well established that the BALB/c strain of mice is extremely susceptible toL. majorinfection, due to the preferential development of Th2 responses. It has also been shown, however, that these mice have the potential to develop protective Th1 responses under appropriate conditions. In this paper we confirm earlier reports that BALB/c mice are capable of developing immunity when challenged with low doses ofL. majorand show that this is dependent on the induction of a Th1 response which can be manipulated with anti-cytokine antibodies in the same way as more conventional experimental infections. Moreover, our data indicate that the development of immunity or susceptibility toL. majorin the BALB/c mouse may reflect factors specific to infection such as persistance of the pathogen, infection of APC, or relative cytokine levels rather than simple antigen load, a finding which may be of general significance in infectious disease.
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