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Ascaris lumbricoides. Samuel Perry. Taxonomy. Kingdom Animalia Phylum Nematoda Class Secernentea Order Ascaridida Family Ascarididae Genus Ascaris Species lumbricoides. - PowerPoint PPT Presentation
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Ascaris lumbricoidesSamuel Perry
TaxonomyKingdom Animalia
Phylum NematodaClass Secernentea Order Ascaridida
Family AscarididaeGenus AscarisSpecies lumbricoides
IntroductionAscaris lumbricoidesLargest and most common roundworm in
humans.Ranges worldwide but concentrated in tropical
and subtropical areas.Over 1 billion infected worldwide. Rare in the
United States.Oldest eggs are over 24,000 years old found in
fossilized feces.Definitive host – HumansIntermediate host – None
MorphologyMales are more slender, and rarely reach
over 30 cm. Females are broader and can reach lengths of 35 cm.
Both are milky white or pinkish and have circular striations on their cuticle.
Ascaris lumbricoides have three prominent lips on their anterior end.
Life Cycle
Quick Review – Listening?Is this parasite common? In the US?How large is this parasite?What animal is the definitive host?
EggsExcessive heat and dryness may kill them.Remain viable in favorable conditions for
long periods.Bleach does not kill them.
Fertile
Infertile
SymptomsAscariasis – disease caused by infection of
Ascaris.Generally a benign infection at low numbers.May develop pneumonitis with large amounts
of larval migration.Asthma attacks may also accompany a larger
infection.Heavy infections may create bowel
obstructions and other issues. Warning - Distrubing
SymptomsWorms may exit body through the anus, and
in more severe infections, they may exit through the mouth or nose.
DiagnosisDetection of eggs in the feces is key. With the
large amount of eggs being laid, this is relatively easy.
Detection of larvae in the sputum or in gastric washing.
Many of those infected wake to find worms exiting through their anus, nose, or mouth. They may simply find a worm in their underpants, or on their pillow in the morning.
TreatmentAscarides will be effective. Mebendezole is the drug of choice.
PreventionProper disposal of human waste/good
sanitation.Safe control of use or no use of night soilWash hands after handling soil.