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

Science  04 May 1973:
Vol. 180, Issue 4085, pp. 502-504
DOI: 10.1126/science.180.4085.502


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.