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L A S T O C Y S T I S

H O M I N I S

GASTRO INTESTINAL TRACT

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'OR()OLOG*

• )a&e se&eral ain for s of theorganis (oly orph• &acuolar+• granular+

• a eboi% an%• cyst• ,acuolar for s" consist of a spherical cell

containing a large single &acuole #

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'OR()OLOG*"

• Granular cells: contain many smallgranules in the cytoplasm or the central

vacuole.• The cells range between an average of 4and 15 micrometers in diameter. Multiplenuclei up to 4! can be present.

• These are the most common forms of B.hominis .

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'OR()OLOG*"

• 'ulti&acuolar an% a&acuolar for s"• contain any s aller &acuoles orno &acuoles $ithin a s aller cell

• Size" - . / icro eters in%ia eter#

• 0or 1 nucleus ten%s to be

present+

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'OR()OLOG*"

• Cyst for "• A har%+ resisti&e for bet$een 4an% 05 icro eters in %ia eter#

• A thic6 $all encapsulates thestructure $hich inclu%es any&acuoles

• )as 0 or 1 nuclei#

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Source :http://www.dpd.cdc.gov/dpdx/HTML/Blastocystis.htm

Life Cycle

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CLINICAL S*'(TO'

• asy pto atic an%sy pto atic

• Se&ere infection" $atery%iarrhea+• nausea+ ab%o inal pain+

perianal pruritus+ an%e7cessi&e 8atulence 9e7cessi&egas:#

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!IAGNOSIS

• is %iagnose% using icroscopy on a stoolsa ple#

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SO;RCE")TT("A.?

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E(I!E'IOLOG* (RE,ENTION

• it is ore co on in less%e&elope% nations an% ay prefer

tropical an% sub.tropical cli ates#• )an%$ash $ith soap an% $ater

before han%ling foo% an% after

using the toilet• A&oi% potentially infecte% $ater

an% foo%