The jejunal cellular responses in chickens infected with a single dose of Ascaridia galli eggs.

This histopathological study was carried out in order to investigate the cellular response in the jejunum to Ascaridia galli during the first 7 weeks of infection. Fourty-two ISA Brown chickens (7 weeks old) were infected orally with 500 embryonated A. galli eggs each while 28 chickens were left as uninfected controls.

The use of genetically marked infection cohorts to study changes in establishment rates during the time course of a repeated Ascaridia galli infection in chickens.

This study investigated the changes in establishment rates during the time course of a 6 week trickle infection of chickens with Ascaridia galli at two different dose levels, using a molecular marker. To differentiate early and late infection, two different egg cohorts (haplotype a and haplotype b, genetically identified using PCR-linked restriction fragment length polymorphism on the cox1 gene of the mitochondrial DNA) were used. Cohort-specific egg batches were produced by harvesting eggs from the uteri of female worms of the specific cohort.

Population dynamics of Ascaridia galli following single infection in young chickens.

The population dynamics of Ascaridia galli was studied in 70 ISA Brown layer pullets, 42 of them were each experimentally infected with 500 embryonated A. galli eggs and 28 chickens were kept as uninfected controls. Six chickens from the infected group and 4 from the control group were necropsied at 3, 7, 10, 14, 21, 28 and 42 days post-infection (d.

Localization of Ascaridia galli larvae in the jejunum of chickens 3 days post infection.

The normal habitat of the parasitic stages of Ascaridia galli is in the small intestine of poultry but the exact localization is poorly understood. Therefore, a histological study was conducted in order to localize the larvae during the early phase of infection. Six layer pullets seven-week old were infected orally with 20,000 embryonated A.

Prevalence of strongyles and efficacy of fenbendazole and ivermectin in working horses in El Sauce, Nicaragua.

Horses, mules and donkeys are indispensable farming and working animals in many developing countries, and their health status is important to the farmers. Strongyle parasites are ubiquitous in grazing horses world-wide and are known to constitute a threat to equine health. This study determined the prevalence of strongyle infection, the efficacy of ivermectin and fenbendazole treatment, and strongyle re-infection rates of working horses during the dry months in Nicaragua.