Epidemiological study on the transmission of schistosomiasis in Saudi Arabia (Western region)

age age differences children disease transmission edad enfermedades humanas enfermedades transmitidas por agua epidemiologia epidemiologie epidemiology esquistosomosis genre humain human diseases maladie de l'homme maladie transmissible par l'eau mankind riesgo risk risk factors risque saison schistosoma mansoni schistosomiasis schistosomose seasons transmission des maladies