Internalism, externalism and life-cyclism in the history of helminthology.

The history of helminthology in the Early Modern Period has been characterized as a debate between two camps, the internalists and the externalists. The internalists believed that helminths are spontaneously generated within the body of the host, whereas the externalists claimed that helminths enter the host from the external environment. According to the this account, the debate between these two camps ended in the nineteenth century with the victory of the externalist viewpoint. Here, we redefine these two terms, as well as the beliefs that the two groups upheld. We suggest that internalists were not necessarily committed to the theory of spontaneous generation, nor were externalists committed to its rejection. These terms only refer to the place where helminths supposedly originate, but not to the process by which they are generated. Thus, some internalists rejected the theory of spontaneous generation, while others held externalist viewpoints and at the same time accepted this theory. We claim that the debate did not end with the victory of the externalist camp; rather, a new position which we call "life-cyclism", emerged and incorporated some elements of the two earlier positions.

Hepatitis aguda recurrente inducida por albendazol / Recurrent albendazole-induced acute hepatitis

Resumen El albendazol es un medicamento usado para tratar infecciones por helmintos y usualmente presenta pocos o ningún efecto secundario. A pesar de que hay un incremento transitorio de enzimas hepáticas luego de su uso, existe poca evidencia en la literatura en la que se reporte lesión hepática luego de automedicación con albendazol. En este informe, el paciente se presentó con hepatitis aguda luego de automedicarse con albendazol. El paciente cuenta además con una historia de episodios similares después de haber usado el fármaco. Se evaluada la causalidad con el método de evaluación de causalidad de Roussel Uclaf del Concejo para Organizaciones Internacionales de Ciencias Médicas, cuyo resultado fue un puntaje de 10, lo que indicó una alta probabilidad de lesión hepática inducida por albendazol al cabo de realizarse una investigación rigurosa y de excluir otras posibles causas de la condición física del paciente. En conclusión, aunque es ideal agilizar el proceso para combatir a los helmintos, es necesario intensificar la necesidad de monitorizaciones de calidad para evitar reacciones adversas como la hepatitis inducida por medicamentos. Asimismo, la automedicación de cualquier medicamento debe ser siempre evitada.

Abstract Albendazole is used to treat helminth infections and usually has minimal or no side effects. A transient increase in liver enzymes is common following its use, but little evidence of albendazole-induced liver damage has been reported in the literature. This study presents a patient who developed acute hepatitis following self-medication with albendazole. The patient also had a history of similar episodes in the past after using the drug. After a thorough investigation and exclusion of all other causes of the patient's clinical condition, the Roussel Uclaf Causality Assessment Method of the Council for International Organizations of Medical Sciences scale yielded a score of 10 points, indicating a high probability of albendazole-induced liver damage. In conclusion, expediting the process of combating helminths is ideal, but quality monitoring is required to avoid adverse reactions such as drug-induced hepatitis. Moreover, self-medication with any drug should always be discouraged.

Helminths of wild hybrid marmosets (Callithrix sp.) living in an environment with high human activity / Helmintos de saguis (Callithrix sp.) híbridos de vida livre vivendo em ambientes com alta atividade humana

The objective of this study was to identify the helminth fauna in hybrid, non-native marmosets, through analysis of fecal samples. The study involved 51 marmosets (genus Callithrix) from five groups living in places with levels of human impact in Viçosa-MG. The marmosets were caught using a multiple-entrance trap and were anaesthetized. Feces were collected, refrigerated and analyzed by means of the sedimentation technique (Hoffmann-Pons-Janner). Eggs and parasites were identified, but not counted. Most of the marmosets (86%) were parasitized by at least one genus of helminths. Among the infected marmosets, 37% presented co-infection. The intestinal helminths comprised four different taxa: Primasubulura jacchi, Ancylostomatidae, Prosthenorchis sp. and Dilepididae.P. jacchi and Ancylostomatidae had higher prevalences (> 80% and > 40%, respectively) and were found in all marmoset groups. Dilepididae species were found in almost all the groups, but only accounted for around 30% of the marmosets. Prosthenorchis sp. showed a relatively low prevalence (< 10%) and was only found in one group. Although two parasites are commonly found in marmosets and other primates (P. jacchi and Prosthenorchis sp.), our study is the first record for Ancylostomatidae and Dilepididae. Factors like marmosets' feeding behavior and their contact with humans and other species of nonhuman primates seem to be determinants of infection among marmosets.

O objetivo do presente estudo foi a identificação da helmintofauna em saguis híbridos e introduzidos, por meio de análises de amostras fecais. O estudo envolveu 51 saguis do gênero Callithrix, de cinco grupos que ocupam áreas com diferentes impactos humanos. Os saguis foram capturados com armadilha de múltiplas entradas e anestesiados. Fezes foram colhidas, refrigeradas e analisadas pela técnica de sedimentação (Hoffmann-Pons-Janner). Ovos e parasitas foram identificados, mas não contados. A maior parte dos saguis (86%) estava parasitado por, pelo menos, uma espécie de helminto. Do grupo infectado, 37% apresentou coinfecção. A diversidade helmíntica intestinal incluiu quatro táxons diferentes: Primasubulura jacchi, Ancylostomatidae, Prosthenorchis sp. e Dilepididae. P. jacchi e Ancylostomatidae apresentaram as maiores prevalências (> 80% e > 40%, respectivamente) e foram encontrados em todos os grupos. As espécies de Dilepididae apresentaram aproximadamente 30% da prevalência e foram encontrados em quase todos os grupos. A espécie Prosthenorchis sp. apresentou prevalência relativamente baixa (< 10%) e foi encontrado somente em um grupo. Considerando que duas das espécies são parasitas comumente descritos para saguis e primatas (P. jacchi e Prosthenorchis sp.), este estudo consiste no primeiro registro para Ancylostomatidae e Dilepididae. Fatores como o comportamento alimentar e o contato com o homem e outras espécies de primatas não humanos, parecem ser determinantes na contaminação dos saguis.

Managing helminths of ruminants in organic farming.

The use of anthelmintics is strongly limited in organic farming. This may induce a change in the intensity (no of worms) and diversity (proportions of species) of helminth infection. Helminths remain a major preoccupation in organic sheep farming: high levels of infection have been recorded on several farms and helminth diversity is always higher. The helminth infection in milk cattle of northern Europe is controlled and diversity is higher in organic farms, as recorded in sheep. The role of helminth diversity on intensity is still unclear. Grazing management is one of the means to controlling helminths. The use of safe pastures for calves and sheep after weaning is one of the major components of control. The use of alternate or mixed grazing is common for cattle in northern countries but is uncommon for sheep in France. Grazing management is not sufficient to controlling infection in sheep and conventional anthelmintic treatments are performed. Additionally, alternative treatments are used. The alternative therapies based on phytotherapy or homeopathy are largely recommended in organic farming but do not have any demonstrated efficacy. More research is needed to evaluate such therapies.