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Infection and Immunity, December 2003, p. 6830-6834, Vol. 71, No. 12
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.12.6830-6834.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

The Site of Leishmania major Infection Determines Disease Severity and Immune Responses

Tracey M. Baldwin, Colleen Elso, Joan Curtis, Lynn Buckingham, and Emanuela Handman*

The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia

Received 9 June 2003/ Returned for modification 2 August 2003/ Accepted 30 August 2003

Inbred strains of mice infected with Leishmania major have been classified as genetically resistant or susceptible on the basis of their ability to cure their lesions, the parasite burden in the draining lymph nodes, and their type of T helper cell immune responses to the parasite. Using the intradermal infection at the base of the tail and the ear pinna, we compared for the first time the above-mentioned parameters in six strains of mice infected with metacyclic promastigotes, and we show that the severity of disease depends greatly on the site of infection. Although the well-documented pattern of disease susceptibility of BALB/c and C57BL/6 mice described for the footpad and base-of-the-tail models of leishmaniasis were confirmed, C3H/HeN and DBA/2 mice, which are intermediate and susceptible, respectively, in the tail and other models, were resistant to ear infection. Moreover, in the CBA/H, C3H/HeN, C57BL/6J, and DBA/2 mouse strains, there was little correlation between the pattern of cytokines produced and the disease phenotype observed at the ear and tail sites. We conclude that the definition of susceptibility and the immune mechanisms leading to susceptibility or resistance to infection may differ substantially depending on the route of infection.

* Corresponding author. Mailing address: The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia. Phone: 61-3-9345-2476. Fax: 61-3-9347-0852. E-mail: handman{at}wehi.edu.au.

Editor: W. A. Petri, Jr.

Infection and Immunity, December 2003, p. 6830-6834, Vol. 71, No. 12
0019-9567/03/$08.00+0     DOI: 10.1128/IAI.71.12.6830-6834.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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