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- W2065659741 abstract "In the early 1970s, Ken Wan-en published an epic challenge to all th~se who maintained that the declines in age-specific prevalence and intensity of schistosomiasis seen in endemic areas were la~,,ely due to acquired immunity, In his article ~ entitled 'Regulation of the prevalence and intensity of schistosomiasis in man: immunology or ecology?' Ken ar~gued that it was intrinsic biological characteristics of the schistosomes together with behavioural factors such as age-related declines in water contact, rather than acquired immunity, that generated the typical convex curves. Twenty years on, following long ,nd detailed studies in Kenya, The Gambia ard Brazil, it appeared that Ken's question had been conclusively answered: obviously, water contact was an important determinant of schistosome infection, but acquired immunity was a major factor in generating the observed age-specific patterns of infection in endemic areas. But now Bruno Gryseels 2 has, through his fascinating observations made in newly emergent loci, once again thrown the question of the importance of human immunity wide open, though this time the subtext of the question posed is in effect: 'Immunity or puberty?' Probably this question can only be settled by continuing study of these emergent foci of human schistosomiasis, but we should not forget ti t animals too get schistosomiasis, and that we can learn a lot from 'comparative medicine' studies on livestock infected with their own specie: of sct~istosomes and work on indigenous species of monkeys infecled with human schistosome species. Fifteen years ago we reported that Schistosoma bovis (a member of the S. haematobium species group) in the natural bovine host does, like the human schistosome species, show declines in age- specific prevalence and intensity of infection in endemic areasL Experimental challenge infection of putatively immune cattle with age-matched controls confirmed that these cattle were indeed clinically highly resistant to challenge, whereas the age-matched controls were severely affected 4. Parasitologically, we found that this resistance to the effects of challenge infection was mediated mainly by suppression of worm fecundity, rather than prevention of challenge worm maturation. Indeed, cattle with high levels of clinically protective immunity nevertheless harboured large numbers of adult worms, though these prociuced few eggs. Evidence that this suppression was likely to be immunologically induced came from the demonstration that 'suppressed' worms resumed hig~l levels of egg production when surgically t~-ansplanted to naive, age-matched controls ~ and that fecundity-suppressive effects could be passively transfen-ed with serL, m 6. Recently, Jozef Vercruysse and coileagues have reported that cattle also naturally develop a similar type of acquired ~mmunity to S. mattheei, another member of the S. haemutobium species group:'. I think it likely that a similar type of naturally acquired immunity may occur in human schistosomiasis, particularly since, as was" @default.
- W2065659741 created "2016-06-24" @default.
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- W2065659741 date "1996-04-01" @default.
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- W2065659741 title "Immunity to schistosomes in humans and other animals" @default.
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- W2065659741 doi "https://doi.org/10.1016/0169-4758(96)80810-6" @default.
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