IID & Immuno Flashcards
Congenital syphilis skeletal abnormalities
- demineralization of proximal medial tibia (Wimberger sign)
- sawtooth metaphyseal serration (Wegener sign)
- diaphyseal periosteal reaction with new bone formation
- Irregular areas of rarefaction and increased density (moth-eaten appearance)
Small stippled epiphyses and cortical thickening
congenital hypothyroidism
osteopenia with callus formation and pseudo paralysis
osteogenesis imperfecta
extensive bone resorption and generalized bone radiolucency.
Hyperparathyroidism
umbilical cord with blue and red stripes interspersed with white areas
subacute necrotizing funiculitis; congenital syphilis
HIV viral loads checkpoints for baby born to mother with well controlled HIV
<48 hours
14 to 21 days after birth
1 to 2 months of age
4 to 6 months of age.
GBS facts
- encapsulated by a polysaccharide layer rich in sialic acid
- catalase-negative, bacitracin resistant, and forms beta-hemolysin, a pore-forming toxin that destroys the host’s red blood cells resulting in hemolysis
Hutchinson triad
- Hutchinson teeth
- interstitial keratitis
- SNHL
common microbes isolated from peritoneal cultures in cases of spontaneous intestinal perforation.
Candida and coagulase-negative staphylococcus epidermidis
XR findings and timing of signs in osteomyelitis
Diagnosis may be apparent on XR by 7 to 10 days post-infection as evidenced by bony destruction, focal area of metaphyseal necrosis, and soft tissue swelling.
do skeletal survey to assess other bone invovement
Cytomegalovirus virus type
double-stranded herpes DNA virus passed via secretions, sexual
intercourse, blood products, transplacental, intrapartum or via breastmilk→ standard
Rubella type and precautions
RNA virus passed via respiratory secretions→ contact and respiratory
droplet
Listeria: type and precautions
gram-positive rod passed via unpasteurized milk and soft cheeses, uncooked meat
and unwashed raw vegetables→ standard
ParvoB19: type and precautions
single-stranded DNA passed via respiratory secretions, transplacental→
droplet
HSV type and precautions
double-stranded herpes DNA virus passed via contact with lesions, or
rarely transplacental→ contact
Toxo type and precautions
intracellular parasite passed by poorly cooked meat, cat feces or
transplacental→ standard
RSV type and precautions
RNA paramyxovirus passed by direct contact with secretions,
highly contagious→ contact
Varicella type and precautions
DNA herpes virus passed via respiratory droplets, contact with rash or transplacental→ airborne and contact
HIV type and precautions
RNA retrovirus passed via blood, sexual contact,
transplacental or via breastmilk→standard
TB type and precautions
slow-growing acid-fast bacillus
respiratory secretions
mucous membranes or skin
rarely hematogenous spread from an infected placenta or aspiration of infected amniotic fluid
airborne and contact
Risk of stillbirth
Listeria, Parvovirus B19, Syphilis, Malaria
CMV transmission via BM
- CMV transmission via breast milk is more likely to occur among preterm infants
- Freezing and pasteurization reduces CMV transmission
Toxoplasmosis Transmission and Severity
Transmission increases with GA
Severity decreases with GA
Treponema pallidum transmission and severity
Transmission can occur at any time
Severity increases with GA
Rubella transmission and severity
Transmission most likely in early and late pregnancy (U-shaped
distribution)
Severity decreases with GA
CMV transmission and severity
Transmission any time
Severity decreases with GA
Timing of HSV surface cultures in asymptomatic exposued in infant
12-24 hours after birth
When does IgG disappear?
9 months
When does IgG decrease
6 months
HIV positive mom breastfeeding concerns
Antiretroviral drugs have differential penetration in human milk, raising concerns about toxicity
to infants receiving breastmilk
Definitive rule out of HIV in infant born to HIV positive mother
1) 2+ negative HIV RNA or DNA ≥1 months age (1 ≥4 months)
2) 2+ negative HIV Ab test ≥6 months
When does IgA production begin in neonate
After birth
Osteomyelitis MC sites
METAPHYSIS
femur > humerus > tibia > radius > maxilla
Osteo treatment
21-42 days PCNase resistent penicillin, aminoglycoside or cephalosporin
septic arthritis treatment
2-6 weeks PCNase resistent penicillin and aminoglycoside
osteo prognosis
joint deformities if epiphyseal plate damage
septic arthritis prognosis
greater risk than osteo of permanent abnormality
omphalitis treatment
PCNase resistant - use methicillin/nafcillin/oxacillin
vanco if MRSA
gentamicin or cephalosporin
+ anaerobic if black periumbilical region
Meningitis spread
hematogenous
Duration of treatment for meningitis
10-14 days GBS
14-21 days Listeria
21+ days for GNR
if E.coli UTI consider what other disease
galactosemia
acute purulent conjunctivitis
s. aureus
N.gonorrhea conjunctivitis prevention and treatment
0.5% erythro preventino
treat with 3rd gen cephalosporin
Chlamydia treatment
no prevention
treat with 14 days PO erythromycin 20% require 2nd course
which is MCC conjunctivitis
chlamydiae
which conjunctivitis is more puruluent
gonorrhea
Chorioretinitis causes and differences
salt and pepper: syphillis, Rubella
yellow + white lesions: HSV, CMV
atrophic: toxo
fluffy white: candida
MCC serotype GBS
III
IAP effect on late onset GBS
none
GBS mortality EOS and LOS
5-10% and 2-6%
MCC serotype listeria EOS
serotype Ia and Ib
AF in listeria
chocolate colored
LOS
IVB
mortality of listeria
EOS 25% and late 15%
Syphillis placenta
large
Syphilis % symptomatic
33%
Nontreponemal screening tests
VDRL and RPR
Treponemal confirmatory tests
FTA-ABS, particle agglutination or enzyme immunoassay
how long do treponemal tests stay reactive
for life even after treatment
What disease leads to false positive treponemal test
Lyme disease with ANA positive; VDRL will show true negative
False positive non-treponemal tests
AI, TB, viral, endocarditis, passive maternal IgG
False negative non-treponemal tests
early primary, latent, late congenital or if prozone phenomenon (excess Abs prevent complexing - so dilute the sera)
when do you repeat a negative treponemal test if non-treponemal screening was positive
2-4 weeks
when to retreat infant with syphillis
if titers (obtained 2,4,6,12 mos) are increasing or persistent - LP and treat with PCN 10 days
Diagnosis media for gonorrhea
Thayer-Martin (rapid plating)
GC conjunctivitis requires emergent treatment bc
corneal ulceration or perforation
what is not seen on gram stain
chlamydia trachomatis
C.trach treatment
14 days PO erythromycin base or ethylsuccinate
untreated maternal chlamydia ppx for infant
none
untreated maternal gonorrhea ppx for infant
1 dose ceftriaxone
TB transmission congenital and postnatal
congenital:hematogenous and infected AF
postnatal: resp secretions or traumatized MM or skin
asymptomatic baby, active TB mom
what is testing plan?
inh for 3-4 months then ppd
positive > reassess for TB
if no disease INH 9 months (12 if HIV)
negative > dc INH
repeat PPD q2-3mos for 1 year then yearly
isolate baby if mother noncompliant, respiratory symptoms or MDR
congenital TB treatment
what do you add if meningitis?
INH, RIF, pyrazinamide + aminoglycoside
+ CTX if meningitis
typically 9-12 months
C.botulinum affects what neurotransmitter
ACh release –> descending paralysis, ocular palsy, poor feeding
Dx botulinism
Stool toxin
EMG: incremental response at high fx, abnormal spontaneous activity, abundant & brief small amplitude AP
TX botulinism
human derived IV botulism Ig
NOT abx - aminoglycosides can increase NM blockade
C.tetani affects what neurotransmitter
blocks GABA and NMJ –> difficulty swallowing, rigidity, muscle spasms, fever, continuous crying, seizure, lockjaw
Tx C.tetani
tetanus Ig : neutralize circulating unbound toxin
PCN G 10-14 days
diazepam for muscle spasms
still need vaccine because disease does not confer immunity
Use of dexamethasone in H.influenzae
to prevent hearing loss in meningitis - give with or before first dose of antibiotics
most common strain of RSV
A
Infant > 2000 g what to do based on maternal hep B status
negative - hep B after birth
unknown - test mom ASAP, hep B to baby < 12 hours; 7 days await moms results
positive - hep B vax + HBIg < 12 hours
+2 more doses for all
Breastfeeding does not increase risk
Infant < 2000 g what to do based on maternal hep B status
negative - hep B when > 2000 g, 30 days or at dc whichever first
unknown - test mom ASAP, hep B vax < 12 hours; 12 hours to await moms results
positive - hep B vax + HBIg < 12 hours
+3 more doses (unless first given > 2000g then only 2 more)
Breastfeeding does not increase risk
maternal hep C positive
test neonate, NAAT at 1-2 months
ToRCH highest risk LBW
CMV