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Science 4 May 1973:
Vol. 180. no. 4085, pp. 502 - 504
DOI: 10.1126/science.180.4085.502
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Articles

Arrested Development in Human Hookworm Infections: An Adaptation to a Seasonally Unfavorable External Environment

G. A. Schad 1, A. B. Chowdhury 2, C. G. Dean 3, V. K. Kochar 3, T. A. Nawalinski 3, J. Thomas 3, and J. A. Tonascia 4

1 Department of Pathobiology, Johns Hopkins University School of Hygiene and Public Health, Baltimore, Maryland 21205
2 Division of Parasitology, Calcutta School of Tropical Medicine, Calcutta 12, India
3 Johns Hopkins University Center for Medical Research and Training, Baltimore, Maryland 21205
4 Department of Biostatistics, Johns Hopkins University School of Hygiene and Public Health, Baltimore, Maryland 21205

Contrary to general belief, larvae of Ancylostoma duodenale do not always develop directly to adulthood upon invasion of man. In West Bengal, India, arrested development appears to be a seasonal phenomenon which results in (i) reduction of egg output wasted in seeding an inhospitable environment and (ii) a marked increase in eggs entering the environment just before the monsoon begins.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Predisposition to hookworm infection in humans.
G. Schad and R. Anderson (1985)
Science 228, 1537-1540
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