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abdomen adult Africa amebae anopheles ascaris attack bacteria become bedbugs bites blood blood-sucking body breeding bugs cats cause cavity cells cercariae common containing corpuscles cycle cysts digestive tract disease dogs effect eggs embryos encysted evidence feces feed female fish flagellates fleas flukes frequently genus glands granules habits hatch head histolytica hookworm human infection human parasites immunity India infection intermediate hosts intestine kala-azar known large numbers larvae legs Leishmania length less lice live liver maggots malaria male mature membrane mites mosquitoes mouth mouthparts myiasis nematodes normal nucleus occur organs pair parasites pigs places posterior present probably proboscis produce proglottids protozoa pupae rats relapsing fever reproduction result rodents sandflies segments skin snails sometimes sore species spirochaetes stage stomach sucker sucking symptoms syphilis tapeworms temperature ticks tissues transmission transmitted treatment tropical trypanosomes tsetse flies ulcers usually ventral worms yellow fever