A. Intestinal Nematodes.
ORGANISM 1 Ascaris lumbricoides
COMMON NAME: Giant intestinal roundworm.
GEOGRAPHICAL DISTRIBUTION: Worldwide.
PREVALENCE: Most prevalent helminth infection, 25 %of lumen helminthiasis.
PATHOGENESIS: Enteritis, inflammation, obstruction, toxicity, eosinophilia,
hemmorrhage, trauma by penetrating adults.
HABITAT: Small intestines.
INTERMEDIATE HOST: None.
RESERVOIR HOST: Swine.
INFECTIVE FORM: Embryonated egg.
MODE OF INFECTION: Ingestion.
SPECIMEN OF CHOICE: Feces.
Figure 4-3. Life cycle of Ascaris lumbricoides.
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