37 & 38: Infectious diseases of pregnancy

ascending infection from vagina/cervix

maternal blood

penetrating trauma

sources of vertical transmission

•Toxoplasmosis

•Other (varicella, parvovirus B19, listeria)

•Rubella

•Cytomegalovirus

•HIV

•Herpes, Hepatitis B & C

•Syphilis

list the TORCHHeS infections

rubella and syphilis at first prenatal visit

-some countries also screen for toxoplasmosis

pregnant women should be screened during 1st trimester for these TORCH infections at their first prenatal visit

HIV

syphilis

hep B and C

chlamydia

ALL women are screened for these during first trimester

HHSV and gonorrhea

diseases screened during first prenatal visit only if high risk

group B strep

screened in ALL women during 36-37 weeks gestation

HIV, syphilis, chlamydia, gonorrhea

screened during third trimester if high risk

-rubella

-toxo and CMV

TORCH infections associated with blueberry muffin rash

blueberry muffin rash

extramedullary hematopoiesis in the dermis

T. gondii

-intracellular parasite found in undercooked meat, unwashed fruit, and litter box

-cats the only definitive hosts

oocyts--> tachyzoites in acute form---> bradyzoites (chronic)

-oocytes infectious found in feces, contaminated foods

acute and chronic forms of T. gondii

-typically asymptomatic and self limited; symptoms are typically mono like

-prior infection results in immunity

presentation of maternal toxoplasmosis

•Tachyzoite replication destroys infected cells

•Necrosis can become tissue calcification---> intracranial calcifications

pathogenesis of congenital toxoplasmosis

chorioretinitis, hydrocephalus, intracranial calcifications

-chorioretinitis is later sequelae

classic diagnostic triad of congenital toxoplasmosis

congenital toxoplasmosis

-more severe manifestations usually indicate infection earlier in gestation

-no symptoms at birth= still at risk

-PREVENTION

-treatment of acutely infected women reduce risk of fetal transmission, reduce severity

best option of toxoplasmosis treatment

-RNA virus, familly matonaviridae, genus rubivirus

-aka german measles

virus family of rubella

children: generalized maculopapular rash on face, spreads to trunk

adults: prodrome fever, generaliized rashes, polyarthralgias

presentation of rubella

rubella

-associated with forchheimer spots (rose spots) on the soft palate

rubeola

associated with koplik spots, white spots on buccal mucosa

-pathognomonic for measles

highest risk in first 12 weeks

when is the highest risk of congenital rubella transmission?

sensorineural deafness, cataracts, congenital heat disease (eye <3 ruby earrings)

clinical triad of congenital rubella syndrome

-prevent with vaccine prior to pregnancy and avoidance

-supportive care only, close monitoring of infant over first year; no effective antiviral for baby

-isolate infected mom, shed virus in urine, stools secretions for one year

treatment of congenital rubella

rubella

virus that can be isolated from blood, urine, CSF, and throat swab specimens

human herpesvirus-5

-family herpesviridae; enveloped, dsDNA

virus family of CMV

cytomegalovirus

leading cause of nonhereditary sensorineural hearing loss; most common congenital viral infection

cytomegalovirus

•Lytic replication inside endothelial cells results in owl’s eye inclusion bodies

•Viral protein UL16 prevents expression of NK cell activating receptor ligands

cytomegalovirus

symptoms/presentation is inversely proportional to gestational age at time of transmission

-usually asymptomatic or subclinical

-symptomatic = mononucleosis (not EBV)

-primary infections have higher risk of transmission to baby

presentation of CMV in mom

congenital CMV

Chorioretinitis, Microcephaly, periVentricular calcifications

-petichiae, microcephaly

-intracranial calcifications, chorioretinitis

-hearing loss

-blueberry muffin rash

-hepatomegaly

-IV ganciclovir for infants with symptomatic congenital CMV

-maternal antiviral therapy not routinely recommended

treatment for congenital CMV

ssRNA, enveloped human retrovirus

virus type of HIV

-very LOW with combination of low viral load and ART therapy

-may occur antepartum, intrapartum, or posttpartum through breastfeeding

rate of vertical transmissio nof HIV

5 months

In untreated infants, the mean incubation period for developing an AIDS-defining condition after vertical transmission is

•Treat with ART within 12 hours of birth

•Bathe infant prior to administering vaccines

tx of HIV in neonates

38 weeks

•Planned cesarean delivery at ____ weeks of gestation is recommended for women who have a HIV viral load greater than 1,000 copies/mL

•Failure to thrive, neurodevelopmental delay, lymphadenopathy, Opportunistic infections (thrush, diaper rash), interstitial pneumonitis, frequent diarrhea, hepatosplenomegaly

-molluscum contagiosum

presentation of congenital HIV

HIV

congenital infection defined by recurrent bacterial infections, lymphoid hyperplasia, chronic parotid swelling, progressive neurologic deterioration, pneumocystis jirovecii

dsDNA virus

•HSV-1 primarily cold sores; HSV-2 primarily genital herpes

•Either strain can cause genital herpes

viral family of herpes simplex

gingivostomatitis

inflammation of the mouth and gums associated with HSV 1

primary HSV

infection type of HSV that causes the greatest risk to fetus

•C-section recommended if herpes lesions are identified on the cervix, in the vagina, or on the vulva at the time of labor or spontaneous rupture of membranes

•Acyclovir is safe and can be used during pregnancy if symptoms are severe and to reduce risk of viral shedding or C-section delivery

prevention of congenital HSV

-rash of skin, eyes, and mouth

-localized CNS disease

-disseminated disease involvign multiple organs

3 patterns of presentation of neonatal HSV

IV acyclovir unntil PCR of CSF is negative ---> then long erm antiviral therapy

treatment of neonatal HSV

motile spirochete treponema pallidum

cause of syphilis

•Lesion at the site of inoculation (chancre)

•Painless; indurated then ulcerates

describe primary syphilis

•Systemic illness; typically resolves spontaneously

•Rash on palms and soles

describe secondary syphiliss

require screeing at 1st visit, 3rd trimester, and delivery

recommendations for congenital syphilis screening in louisiana

•Spontaneous abortion/stillbirth

•Hydrops fetalis

•Prematurity

•Neonatal death

early infection gestation of syphyilis results in

Early congenital syphilis

-presents in first two years of life with snuffles, rash, skeletal abnormalities, IUGR

late congenital syphilis

-after 2 years of age, presents with mulberry molars, saber shins, saddle nose , gummatous ulcers

mulberry molars

Molars with multiple cusps that are caused by congenital syphilis.

interstitial keratitis, hutchinson incisors, 8th cranial nerve deafness

what is the hutchinson triad of congenital syphilis

intersitial keratitis

development of a ground-glass appearance of the cornea and scleral vascularization, which have their onset around puberty; associated with hutchinson's triad

-screening with RPR or VDRL

-prmpt tx with pencillin based regimen

prevention of congenital syphilis

linear dsDNA virus; family herpesveridae

virus type of varicella zoster

congenital varicella

congenital virus with highest risk during second trimester

•Cutaneous scars (dermatomal distribution)

•Neurologic, ocular, GI, and limb abnormalities

•Low birth weight

presentation of congenital varicella synndrome

ranges from mild chicken pox to disseminated infection

presentation of neonatal varicella

•Administer varicella-zoster immune globulin to infants born to women with active varicella infection at delivery

treatment of congenital varicella

•Test mom for immunity if no history of infection or immunization

•If nonimmune- the first dose of the varicella vaccine should be administered in the postpartum period.

•The vaccine is a live attenuated virus and should be avoided in pregnancy and within 1 month of conception

prevention measurers of congenital varicella

parvovirus B19

causes 5th disease (erythema infectiosum )

•May be asymptomatic

•Non-specific flu-like symptoms

•25% have rash +/- arthralgias

maternal presentation of parvo B19

parvovirus b19

-virus destroys RBC progenitors

-diagnosis via PCR of viral DNA in amniotic fluid

-most don't have adverse outcome; risks highest with infection during 1st trimester

-fetal anemia and hydrops fetalis; rarely, fetal loss

fetal presentation of parvovirus B19

Hep C

•primary cause of chronic viral hepatitis in children in industrialized nations

-one of the most common and potentially serious infections in pregnant women

•Typically, asymptomatic

•Usually mild childhood liver disease

symptoms of congenital hepatitis

•Usually asymptomatic at birth

•Chronic antigenemia and elevated liver enzymes

•Most patients develop chronic infection

presentation of congenital hep B

•Breastfeeding is not contraindicated in women who are chronic carriers if their infants have received both the vaccination and HBIg within 12 hours of delivery

is breast feeding okay in women who are chronic carriers of hep B?

HPV 6 and 11

•The most common sexually transmitted infection in US

•In adults, cause genital warts (condyloma acuminatum)

HPV 6 and 11

tho vertical transmission is rare, can lead to juvenile onset of recurrent respiratory papillomatosis

-c section does not prevent trannsmission

juvenile onset recurrent respiratory papillomatosis

-manifestation of HPV 6 and 11 in neonates that results in recurrent benign laryngeal tumors in children

•Progressive dysphonia, stridor, chronic cough, recurrent URTI, hemoptysis

•PE-> reveals multiple verrucous, polypoid growths overlying the true vocal folds, false vocal folds, subglottic region, and trachea.

-require multiiple surgeries before puberty to remove papillomas

-antiviral therapy

-tracheostomy if airway obstruction

tx of congenital HPV 6 and 11

listeriosis

•Why pregnant women are advised to avoid: Unpasteurized dairy products, sprouts, uncooked meats, meat spreads, smoked seafood

-most commonly in 3rd trimester with non-specific flu like illness

maternal presentation of listeriosis

fetal death, preterm birth, infected neonate

-diffuse pustular rash

-granulomatous infantiseptica

fetal presentation of listeriosis

granulomatous infantiseptica

result of listeria in neonate

•Disseminated abscesses or granulomas in multiple organs

•Most are stillborn or die soon after birth

N. gonorrhoeae

-presents as opthalmia neonatorum 2-5 days after birth

opthalmia neonatorum

purulent conjunctivitis with profuse exudate and eyelid swelling

-associated with N. gonorrheae

•Neonate treatment: ceftriaxone

•Prevention: maternal screening and treatment

•Neonatal prophylaxis with ophthalmic erythromycin

treatment/prevention of congenital gonorrheae

chlamydia trachomatis

-presents as inclusion conjunctivitis 5-14 days after delivery

-higher congenital transmission rate

inclusion conjunctivitis

Caused by Chlamydia trachomatis

•Neonate treatment: oral erythromycin

•Prevention: maternal screening and treatment

tx of congenital chlamydia

•Facultative, anaerobic, gram-positive cocci that form chains or diplococci

bacteria type of group B strep

•Causes asymptomatic bacteriuria, UTI, endometritis, chorioamnionitis in pregnant women

manifestation of group B strep in moms

-early onset before 7 days

-presents as sepsis, pneumonia, or meningitis

presentation of group B strep in neonate

•Neonate: ampicillin and an aminoglycoside

•Isolate organism from sterile body site to confirm diagnosis

tx of group B strep in neonate

group B strep (S. agalactiae)

•Gram + cocci in pairs or chains; encapsulated, beta hemolytic, catalase negative•Gram + cocci in pairs or chains; encapsulated, beta hemolytic, catalase negative

N. gonorrhoeae

•Gram - diplococci; facultative intracellular pathogen in neutrophils

•Fastidious; grown on chocolate or Thayer-Martin agar

chlamydia trachomatis

•Gram - rod; obligate intracellular pathogen in epithelial cells

•Distinct life stages: elementary bodies and reticulate bodies