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Strongyloides stercoralis is a parasite that can be acquired not only in tropical and subtropical areas, but also in some European countries. This helminthiasis is often a- or paucisymptomatic, and may persist in a latent state for several decades. In case of immunosuppression, a reactivation of the disease can occur, that may result in severe -- sometimes fatal -- complications, due to a syndrome of hyperinfestation. We present two cases of reactivation in patients suffering from lymphoma under chemotherapy. Screening of this parasite should be proposed for patients that have stayed in an endemic area before any corticotherapy or other immunosuppressive treatment, and in the presence of a disease reducing the immunity.

A POTENTIAL PUBLIC HEALTH PROBLEM: Cercarial dermatitis is caused by the infestation of the skin by cercariae of nonhuman schistosomes whose commonest hosts are aquatic birds. Human contamination can occur during swimming in fresh water infested with cercariae and notably ducks. Its geographic distribution is worldwide and is increasingly described in France during the summer months. FROM A CLINICAL POINT OF VIEW: A diffuse eruption composed of prurigenous maculopapules appears within the 24 hours following exposure. Regression is spontaneous within one day to three weeks. PREVENTION IS ADVISABLE: Treatment is symptomatic in the majority of patients. The optimal prevention, for bathers, is to swim in sufficiently deep water.

Sowda skin lesions are of medical and social importance in Yemen. Ivermectin (Mectizan) chose as a control strategy plan in onchocerciasis is active during 3 months for the less on clinical and histological data. After a short increase of itching and oedematous skin aspects clinical signs decrease. Some patients notice an itching rebound after 90 days. Histologically, localized ingratiates, presence of mononuclear cells and melenin loaded histiocytes and eosinophils decreased. The rythm cure has to be studied on a longer period but 3 to 6 months repetition between oral treatment with 200 micrograms/kg dose during two years could be effective.