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PubMedDate not supplied

[Epidemiological study of intestinal helminthiasis in the island of Tortuga (Haiti). II. Evaluation of the parasite count by means of the Kato method].

Results of the numbering of T. trichiura, A. lumbricoides et N. americanus eggs found in the stool, taken from a representative sample of the population of Tortuga island, shows the importance of parasital load borne by people attacked by the parasites. Those who produce the greatest number of eggs for a gram of faeces are young children. For adults, the evolution of the parasital load follow that of the prevalence, for each Nematodes, with an increase of the average number of eggs of A. lumbricoides per gram of faeces for adults aged 30 to 44, and of the average number of N. amercanus per gram of faeces for adults aged 45 to 59. Moreover women adults show a higher number of parasites than men. Farmers from villages within the interior of the island who are more often attacked than those from the coast, also bear a parasital load which is twice as high. Victims less than 5 years old and more than 30, particularly women, whose faeces are richest in eggs, seem to present the greatest danger for the transmission of ascaridiosis and necatorosis in Toruga Island.

Adolescent↗
PubMed1984

Comparative study of gastrointestinal helminthiasis in sheep on 'clean' grazing and permanent pasture under field conditions.

An investigation of sources of helminth infection was carried out on three flocks: a traditional permanent pasture flock (A), one operating a 'clean' grazing system (B), and an East of Scotland College flock (C) which had operated a clean grazing system for nine years. Ewe and lamb worm egg output and pasture larval levels were recorded and tracer lambs were grazed during July and August on each farm. Considerable contamination was present on farm B fields compared with farms A and C, which resulted in higher worm burdens in late summer in farm B tracer lambs and lower weight gains. The main source of this infection was thought to be ewe periparturient egg output, as 21 per cent of ewes had positive worm egg counts over the lambing period. Differences in management practices between farms B and C, eg, earlier stocking of farm B fields, were also considered contributory factors.

Animals↗
PubMed1981

Effects of clinical and subclinical gastrointestinal helminthiasis on digestion and energy metabolism in calves.

Digestion and energy metabolism trials were conducted in 2 groups of 4 steer calves each, experimentally infected with Cooperia and Ostertagia larvae. In group 1 calves given an amount expected to cause clinical parasitism (8,000 larvae/kg 0.75), fed intake and nutrient digestibility were significant (P less than 0.05) depressed at postinfection week (PIW) 3 (the time that infections became patent); nitrogen balance in these calves were also low. The apparent absorbed nitrogen fraction was significant (P less than 0.05) depressed because of a significant (P less than 0.05) decrease in digestion. Protein catabolism was also increased. Although energy balance was significantly depressed at PIW 3, the calves seemed to recover from the effects of parasitism by PIW 5. In group 1 calves, weight gains were significantly (P less than 0.05) depressed, with mean weight gains of 10.68 kg of body weight as compared with gains of 41.44 kg for group 3 calves (noninfected controls). In group 2 calves given an amount expected to cause a subclinical infection (800 larvae/kg 0.75), nitrogen absorption was significantly (P less than 0.05) depressed at PIW 2 and 3 and energy balance was significantly (P less than 0.05) depressed at PIW 3. In group 2 calves, mean weight gains (34.76 kg) were less than were those for group 3 calves (41.44 kg). The degree of parasitism seen in group 2 calves was comparable with that observed in field examinations of naturally infected calves of approximately the same age. Seemingly, under grazing conditions in Maine, these low levels of parasitism could result in appreciable production losses in young animals.

Animals↗