Site of resistance to Necator americanus in hamsters

Resistance to the development of human hookworm, Necator americanus was examined in 3- to 6-week-old young adult hamsters. Only 3% of N. americanus infective third stage larvae (NaL3) reached maturity in the intestines of young adults as opposed to as many as 60% in 2-day-old baby hamsters. This see...

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Bibliographic Details
Published inActa tropica Vol. 42; no. 4; p. 333
Main Authors Rajasekariah, G R, Deb, B N, Dhage, K R, Bose, S
Format Journal Article
LanguageEnglish
Published Netherlands 01.12.1985
Subjects
Age Factors
Animals
Cricetinae
Immunity, Innate
Intestines - immunology
Intestines - parasitology
Larva - cytology
Larva - immunology
Larva - ultrastructure
Lung - immunology
Lung - parasitology
Necator - growth & development
Necator - immunology
Necatoriasis - immunology
Necatoriasis - parasitology
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Summary:Resistance to the development of human hookworm, Necator americanus was examined in 3- to 6-week-old young adult hamsters. Only 3% of N. americanus infective third stage larvae (NaL3) reached maturity in the intestines of young adults as opposed to as many as 60% in 2-day-old baby hamsters. This seemingly effective resistance prevailing in young adults was investigated in some detail. The skin, the first site of contact for the invading NaL3, was bypassed during the infection process. Completely in vitro exsheathed NaL3 (ExNaL3) were used, and young adult hamsters were infected parenterally, by-passing the skin. Even after exsheathing the larvae artificially before infection and by-passing the skin, no improvement was seen in the development of N. americanus in the intestines of young adults. Higher infection doses also did not increase the worm burden. Some of the factors limiting the development of parasites in young adults were examined. N. americanus were monitored in lungs and intestines during various intervals after infection. Similar parasite burdens were apparent in lungs of baby as well as young adult hamsters. In the intestines, a significantly lower burden of N. americanus was seen during various intervals in young adults compared to the baby hamsters. Moreover, N. americanus were expelled soon after reaching the intestine. This comparative monitoring revealed the intestine as the seat of resistance against the establishment of N. americanus in young adult hamsters.
ISSN:0001-706X