NICU Antibiotics and Outcomes Trial

Randomization and blinding. Physicians will screen infants based on inclusion/exclusion criteria. The site coordinator will confirm eligibility with the treating physician and input patient data into the web based system. Once data is inputted, the coordinator will randomize eligible families 1:1 using web-based block randomization stratified by study site to receive EA or placebo. Multiples (i.e. siblings) will be randomized to the same treatment arm. Randomization will be sent to the investigational pharmacy via email, where study drug will be drawn. Participants, treating clinicians, and study staff will all be blinded to allocation. Outcome assessors and statistical summaries for trial monitoring will be unaware of group allocation. Unblinded data evaluation during the trial will be restricted to a designated study statistician and the Data and Safety Monitoring Board (DSMB). Investigators will be unblinded and analyses initiated only after all data collection forms are completed, data queries resolved, and data are locked for analysis.

Intervention. Following randomization, the coordinator will contact the attending physician, nurse practitioner and/or other providers as appropriate, and nurse to inform them that randomization has been completed. The intervention consists of administering either conventional EA or placebo while completing an evaluation for early onset sepsis. Timing of drug administration will be closely monitored. Enrolled subjects will receive EITHER ampicillin and gentamicin at site approved dosing guidelines OR volume matched equivalent of normal saline. These dosing regimens are derived from updated published guidelines for neonates. No masking is required as each of these solutions is clear.

The study drug will be ordered and in many cases discontinued just as EA would normally be ordered and discontinued; specifically, this means that the drugs will be ordered and administered within 4 hours of life and then discontinued at the discretion of the attending neonatologist. Typically this occurs when blood culture results are deemed negative (expected in > 95% of study subjects). The study protocol will allow the first dose of study drug to be administered as late as 4 hours after delivery. Research coordinators will follow daily orders on all study subjects.

Fecal sample collection. Samples will be obtained exclusively for research purposes, and there will be no testing of patients beyond obtaining microbiome samples, and recording demographic data and clinical history. Spontaneously expelled fecal samples for microbiome analyses will be obtained weekly from study subjects through the first 8 weeks of life, and monthly thereafter until death or discharge.

Infant blood draw. An additional research blood sample for genetic analysis will be drawn one time and should be done at the time of clinical blood draws. However, if this blood draw is missed, it can be done in the neonate's first week of life. A volume of 0.3 to 0.4mL will be drawn in EDTA tubes and shaken well. After the sample is collected, it will be frozen for shipment. The blood draw will be performed by NICU personnel who routinely draw blood on preterm babies. It will be either the bedside nurse or the respiratory therapist depending on whether the blood is drawn from an umbilical catheter or by heelstick.

Maternal vaginal swab and rectal swabs at delivery will be collected. If a rectal swab was not collected at the time of delivery, a maternal fecal sample during the first week postpartum will be collected in its place. Samples will be cryopreserved at -80C.

An electronic database will be used to track sample collection and storage history.

I. Inclusion criteria: We will enroll newborn infants with gestational age of 23-30 weeks 6 days infants at participating study sites will be eligible.

II. Exclusion criteria:

• Infants born for maternal indications via caesarean section with rupture of membranes at delivery, without attempts to induce labor, and without concern for maternal infection
• Infants at high risk of EOS

• Infants born to mothers with intrapartum fever (> 38C) or clinical diagnosis of chorioamnionitis
• Infants born to mothers with previous infant with GBS disease/infection
• Infants with respiratory insufficiency requiring invasive mechanical ventilation and FiO2 > 0.40 or non-invasive ventilation and FiO2 > 0.60 at time of randomization
• Infants with ongoing hemodynamic instability requiring vasopressors or fluid boluses at time of randomization
• Clinician concern infant is at high risk for sepsis due to infant physical exam findings or clinical history of mother or infant
• Major congenital anomalies
• Infants not anticipated to survive beyond 72 hours
• Infants who have received antibiotics prior to randomization
• Mothers that are <18 years old at time of enrollment