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Samenvatting microbiologie: bacteriële pathogenese

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Vroegtijdige arbeid > vroeggeboorte multifactorieel ............................................................................. 2
Microbiële oorzaken van te vroege arbeid/vroeggeboorte .................................................................... 2
1. Introductie neonatale sepsis ............................................................................................................... 3
2. Pathogenese ........................................................................................................................................ 3
Hoe geraakt GBS van rectum/vagina in amnionvocht? ...................................................................... 4
Reservoir GBS = darm microbioom/rectum ........................................................................................ 4
Prevalentie GBS vaginale kolonisatie .................................................................................................. 4
Vaginaal microbioom........................................................................................................................... 4
Risicofactoren ...................................................................................................................................... 5
Candida albicans: GIST (cel-vorm vs (pseudo)hyphae) ................................................................... 5
Dynamisch vaginaal microbioom ........................................................................................................ 6
Virulentiefactoren voor vaginale kolonisatie/persistentie ................................................................. 6
Extracellulaire matrix gastheer........................................................................................................ 7
CPS = Capsular polysaccharide van GBS .......................................................................................... 7
Oppervlakte-eiwitten van GBS: FbsA/B en Srr1 .............................................................................. 7
Pili van GBS ...................................................................................................................................... 8
Uitsteeksels/potrusies van vaginale epitheelcellen ........................................................................ 9
GBS hemolysine ............................................................................................................................... 9
GBS pigment .................................................................................................................................... 9
ScpB ............................................................................................................................................... 10
Transcytose van chorion epitheelcellen door GBS ............................................................................ 11
De immature neonatale long: toegang tot bloedbaan (pneumonia -> sepsis) ................................. 11
GBS doorheen de bloed-hersenbarrière: paracellulaire transversie ................................................ 11
Transcytose M-cel ............................................................................................................................. 12
Extracellulaire vesikels van GBS ........................................................................................................ 12
GBS doet meer dan neonatale sepsis… ............................................................................................. 13
3. Preventie ........................................................................................................................................... 13
A) Risico-of screeningsgebaseerd Intrapartum Antibiotic Prophylaxis (IAP) .................................... 13
B) Ontwikkeling van vaccins (CPS) ..................................................................................................... 14
C) Empirisch behandelen ................................................................................................................... 15




1

, Les 3-4: Bacteriële pathogenese




 Je hebt meeste kans om te sterven op je eerste levensdag

Vroegtijdige arbeid > vroeggeboorte multifactorieel


Asphyxia = zuurstofgebrek tijdens geboorte

Preterm = vroeggeboorte




Microbiële oorzaken van te vroege arbeid/vroeggeboorte




Onder sommige omstandigheden
kunnen vaginale bacteriën toegang
krijgen tot foetale membranen
→ prostaglandines worden getriggerd




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