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Samenvatting H17 intrinsieke pathogenen

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H17 intrinsieke pathogenen zelfgeschreven cursus/samenvatting !! best in bundel te kopen

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17 intracellulaire pathogenen
Mycobacteriën en als onderdeel M. tuberculosis
M. tb-complex =

M. tuberculosis : mens, aërogeen
30% wereldpop besmet

HIV epidemie heeft zeer nadelige invloed
Algemeen verloop:

De bac w ingekapseld dr fagocyten, B en T cellen en indien deze zou barsten wordt het opgehoest
of verspreid via het bloed, wat dodelijk is. Indien de laesie blijft behouden zal het verbeteren.

90% houdt het onder controle en heeft quasi geen symptomen, bij immuundaling wel reactivatie
mogelijk!

Ook bij onvolledige genezing kunnen er granulomen ontstaan
Pathogenese:

aerosol, droplets
bac w opgenomen door macrofagen en DC cellen. de


DC w verhinderd te migreren waardoor SIS pas na 2-3 weken optreedt

Bij replicatie onstaan 2 populaties

actief delende bac persisters

slapend, zorgen vr opflakkeringen

!ongevoelig vr AB → therapeutische schema’s

tot jaren

geactiveerde macrofagen zijn nodig

indien geen eliminatie:
Tuberkels = haardjes necrotisch weefsel, levende bac en reuzencellen (gefuseeerde
macrofagen) met T lymfocyten krans
Deze grote hoeveelheden TNF verklaart de symptomen: nachtzweten, ziektegevoel,
vermageren
→ verkazing bij contact met bronchi → ophoesten bac = hoge besmettelijkheid

niet-gedode bac kunnen andere organen besmetten → infecties
Diagnostiek:
indien geen diep sputum anders mgl: maagtubage

diepe resp stalen
urine, csf, abces, weefsel, biopt, pleuravocht (veel)
zuurvaste keluring bij microscopie: auramine

snel, goedkoop, geeft idee besmettelijkheid
!soms vals-negatief - staalkwaliteit heel belangrijk
indien negatief is TB niet uitgelsoten




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