Phylum NematodaPresent in all kinds of environment12,000 known speciesThe effects of roundworms on crops, domesticanimals and humans make it one of the mostparasitic animal groupsAbout 50 species are plant and animal parasitesthat cause damage
AscarisThe large roundworm of humansLive in host’s intestines and eggs pass out fecesExtremely resistant to adverse conditionsPresent in Uncooked veggies, soiled fingers or toysMake their way up through trachea and get swallowedagain so that they can grow to maturity in the intestinesCause allergic reactions and intestinal blockage.
HookwormsHook into intestinal wallFeed off host’s blood causing anemiaIn children can cause retarded mental and physicalgrowthTravels through the blood to the lungs and into thethroat where it is swallowedEggs are shed in hosts feces and hatch on warm moistsoilLarvae then bore through the feet of a new host
Trichina wormCause lethal disease trichinosisHumans get by eating undercooked pork that iscontaminated with trichinaPenetrate blood vessels and any tissue or space
PinwormsCause little disease, but most commonLive in large intestine and migrate to anal regionto lay eggsMost worms found by viewing feces under amicroscope, but pinwarm can be found byscotch tape method.
Filarial wormUsually found in people in tropical countriesLive in lymphatic systemCause inflammation and obstruction of the lymphaticsystem– Example: elephantitis.