<unk>  is prevalent where raw cyprinid fishes are a staple of the diet. Prevalence rises with age; children under the age of 5 years are rarely infected by Opisthorchis viverrini. Males may be affected more than females. The WHO estimates that foodborne trematodiases (infection by worms or "flukes", mainly Clonorchis, Opisthorchis, Fasciola and Paragonimus species) affect 56 million people worldwide and 750 million are at risk of infection. Eighty million are at risk of<unk> , 67 million from infection with Opisthorchis viverrini in Southeast Asia and 13 million from Opisthorchis felineus in Kazakhstan, Russia including Siberia, and Ukraine. In the lower Mekong River basin, the disease is highly endemic, and more so in lowlands, with a prevalence up to 60% in some areas of northeast Thailand. However, estimates using polymerase chain reaction-based diagnostic techniques indicate that prevalence is probably grossly underestimated. In one study from the 1980s, a prevalence of over 90% was found in persons greater than 10 years old in a small village near Khon Kaen in northeast Thailand in the region known as Isaan. Sporadic cases have been reported in case reports from Malaysia, Singapore, and the Philippines. Although overall prevalence declined after initial surveys in the 1950s, increases since the 1990s in some areas seem associated with large increases in aquaculture.
Opisthorchiasis
Clonorchiasis
Taeniasis
Monorchism
Trichiasis
Trichuriasis
Trichomoniasis
Helminthiasis