Early onset sepsis

Early onset sepsis (EOS) is an infectious complication in newborns that have clinical presentation within the first 72 hours of life. Sometimes also called perinatal due to pathogenesis – vertical transmission shortly before the birth (transplacental), ascendent infection from the cervicovaginal space (chorioamnionitis, funisitis, fetal infection) or during the vaginal delivery. The pathogen can be also the cause of preterm birth with its consequences.

Risk factors

pathologic cervicovaginal colonization (maternal antibiotics, sexually transmitted diseases)
prematurity (immunodeficiency)
invasive procedures (antenatal – amniocentesis)

Types of infection in perinatology and neonatology

congenital infections (e.g. TORCH)
early-onset sepsis (EOS) => within 72 hours after birth
late-onset sepsis (LOS) => after 72 hours of life

Chorioamnionitis

Occurs in around 50-80% of preterm births (inversely proportional to advancing gestation). Fetal inflammatory response syndrome (FIRS) results from the hypercytokinemia that damages immature fetal organs and tissues. Coupled with the prematurity itself, it gives rise to significant neonatal morbidities – bronchopulmonary dysplasia, intraventricular hemorrhage, periventricular leukomalacia, retinopathy of prematurity, necrotizing enterocolitis.

Chorioamnionitis is characterized by clinical (vaginal discharge, maternal fever, fetal tachycardia), biochemical (maternal C-reactive protein, leucocytosis), microbiologic (amniotic fluid culture, cervicovaginal colonization, maternal blood culture, GBS screening) and histology (neutrophil infiltration of placenta, amnion and umbilical cord) features.

Pathogens causing Early onset sepsis

Streptococcus agalactiae

Group B Streptococcus (GBS)
GBS colonization in 30% of pregnancies (cervicovaginal GBS screening at 36 weeks of gestation)
antenatal GBS prophylaxis can reduce the risk of EOS
GBS sepsis, pneumonia, meningitis

Gram negative bacteria

E. coli, Klebsiella, Enterobacter, Proteus, Pseudomonas, Acinetobacter, Citrobacter, Morganella, Serratia species
Gram negative sepsis, meningitis

Listeria monocytogenes

contaminated food in pregnancy => abortion, preterm birth, EOS
adnate (early-onset) listeriosis = granulomatosis infantiseptica (granulomatous inflammation with multiple small abscesses – liver, spleen)
Listeria sepsis, pneumonia, meningitis

Mycoplasma hominis, Ureaplasma urealyticum/parvum

colonization of the lower genitourinary tract in pregnant women
Mycoplasma/Ureaplasma pneumonia

Chlamydia trachomatis

colonization of the lower genitourinary tract in pregnant women (sexually transmitted disease – STD)
Chlamydia pneumonia, conjunctivitis

Herpes simplex virus 1,2 (HSV)

acute genital herpes infection in a pregnant woman => C-section delivery
typical herpetic efflorescences
even suspected infection treated with aciclovir
HSV sepsis, meningoencephalitis

Varicella zoster (VZV)

Varicella exanthema 5 days before and 2 days after birth => the highest risk for EOS
Varicella immunoglobulin

Hepatitis B,C (HBV, HCV)

active and passive anti-HBV immunization
if the plan is to immunize the newborn, HBsAg-positive mother can breastfeed
no immunization against HCV

Human immunodeficiency virus (HIV)

centralization of HIV positive pregnant women
breastfeeding not recommended
zidovudine antenatal prophylaxis and postnatal therapy

Candida albicans

common vaginal colonization
neonatal exanthema, soor, feeding intolerance
antimycotic prophylaxis and treatment

Staphylococcus aureus

rare EOS pathogen
pemphigus = blisters on the skin and mucous membranes, highly contagious
Staphylococcal omphalitis, conjunctivitis, arthritis, osteomyelitis

Diagnosis

Clinical signs

usually non-specific
respiratory distress syndrome (RDS)
apneas
cyanosis
circulation disturbances (tachycardia, poor perfusion, pale color)
thermal instability
petechiae
neurologic symptoms (seizures, irritability, apathy, hypertonia/hypotonia)
hyperbilirubinemia
feeding intolerance, distended abdomen, vomiting, diarrhea

Laboratory findings

inflammatory markers (C-reactive protein – CRP; procalcitonin – PCT, interleukin 6 – IL-6)
full blood count (leucopenia/leucocytosis, shift to the left, I/T index > 0.2, anemia/thrombocytopenia)
metabolism (hyperglycemia)
blood gas (acidosis)
cultures (blood culture, urine, cerebrospinal fluid, bronchoalveolar lavage)
colonization (ear and nose, oropharynx, conjunctiva, rectum)
serology (antibodies)
PCR (cytomegalovirus – CMV)

Screening

during pregnancy (syphilis, hepatitis B – HBsAg, HIV)
postnatally from the umbilical cord (serology tests for syphilis)
→ RPR = rapid plasma reagin = screening test for syphilis (cardiolipin [phospholipid] incorporated in the membrane of Treponema Pallidum reacts with antibodies)
→ TPHA= Treponema Pallidum hemagglutination = diagnostic test for syphilis (detects amount of anti-Treponema pallidum antibodies in the serum sample (umbilical cord) of a newborn)

Prophylaxis

congenital/perinatal infection: syphilis, group B Streptococcus (GBS), hepatitis B, herpes simplex virus, human immunodeficiency virus (HIV)
postnatal infection: anti-epidemic guidelines for the neonatal intensive care unit (NICU) – hand hygiene before and after manipulation with a patient and his environment (equipment)

Therapy

General

ventilation support (oxygen, nasal continuous positive airway pressure – CPAP, mechanical ventilation)
circulation support (volume therapy, inotropes)
immunoglobulins
parenteral nutrition
thermal management

Specific

based on the pathogen
broad-spectrum antibiotics => antibiotic rotation based on the clinical response and individual antimicrobial sensitivity of a pathogen
antivirotics (aciclovir, ganciclovir)
antimycotics (fluconazole, amphotericin B)