Human strongyloidiasis in AIDS era: its zoonotic importance.

Human strongyloidiasis is caused by a nematode Strongyloides stercoralis. Many species cause strongyloidiasis in animals. The parasite has predilection to one host only but the host specificity is not strict. When animal species infects humans there is intense allergic reaction in the form of cutaneous larva currens and larva migrans. Therefore, strongyloidiasis in strict terms is a zoonotic disease. The strongyloides species have three stages. The parasitic form inside the host, the free form stage in the soil or water that moults to infective third stage. The later infects the host through skin and migrate to the heart and lung and finally swallowed back to cause intestinal infection. However, in some cases intense pulmonary manifestations may take place. The Strongyloides stercoralis has unique feature of moulting from parasitic form to infective stage within the body, rather than coming out and forming free living stage and causing autoinfection. This may lead to latent infection for indefinite period in an immunocompetant person but fatal hyper or disseminated infection in immunocompromised person like patients of AIDS, organ transplant recipients, cancer and other patients put on immunosuppressive therapy, in whom it can involve any organ of the body. Because this group of patients in last few years have increased tremendously in Africa and South-East Asia, more and more cases of strongyloidiasis are being reported in english literature. The diagnosis of intestinal strongyloidiasis is made by repeated stool smear examinations and in extraintestinal strongyloidiasis the appropriate specimen is examined for the rhabditiform larvae. Recently serological tests have also been developed that can be used for epidemiological purposes. The drug of choice for the treatment of strongyloidiasis remains thiabendazole but due to its unacceptable side effects other medicines like albendazole and ivermectine are being used more frequently. The prevention of the infection is possible by adopting good personal hygiene and safe drinking water supply.

Medicamentos ectoparasiticidas: risco e benefício / Ectoparasiticides drugs: risk and benefit

A escolha de produtos ectoparasiticidas para uso humano deve obedecer certos critérios, principalmente envolvendo a relaçäo risco-benefício, desde que muitos säo substâncias capazes de destruir formas de vida. As relaçöes adversas, os efeitos colaterais, a toxicidade, aliados a fatores como formulaçöes, interaçäo medicamentosa, incompatibilidades, freqüência das aplicaçöes e outras vias de penetraçäo orgânica devem ser avaliados. O trabalho se propöe a atualizar e revisar os dados farmacológicos e toxicológicos dos ectoparasiticidas mais freqüentemente utilizados para adequar a sua escolha

Tratamiento de las Parasitosis del aparato digestivo. / Treatment in parasitic of digestive sistem.

Se hace una actualización referente a los tratamientos delas parasitosis del aparato digestivo, poniendo énfasis en las características de los más importantes antiparasitarios y señalando los esquemas de tratamiento establecidos para cada uno de ellos.