A Prospective Cohort Study Evaluating the Transplacental Transmission of Respiratory Syncytial Virus (RSV) in Pregnant Women and Their Offspring

Patients will be consented at one of two time points during their pregnancy. Option 1: If mothers present or call Obstetrics and Gynecology (OB) with signs or symptoms of an Upper Respiratory Infection (URI) and or a positive SARS-CoV-2 test, the mother's OB will ask if the mother would be interested in hearing about this study at her next prenatal visit if study personnel are not available to discuss the study at the present appointment. If study personnel is available and on-site, they will approach and consent patients who meet criteria after preliminary screening.

Option 2: Mothers who present to labor and delivery and report a history of an URI in the last three weeks and or a history of positive SARS-CoV-2 will be asked by the labor and delivery team or study personnel, if available, about her interest in the study and approached for consent upon admission to labor and delivery. At the time of consent a research blood sample will be drawn if the patient is not already having labs drawn, if the mother agrees.

The additional data collection will be performed electronically. Research staff will contact participants (in person, via email, and via phone, depending on survey timing). REDCap will be used for data collection, with (offline, when necessary) electronic data capture. Participants can access an online version of surveys using their own device or phone, or use tablets provided for the participants for data collection at the hospitals. Participant will have the option to have research staff conduct the question/interview in-person or over the telephone, if this is preferred.

If the mother is enrolled prior to labor, study personnel will then track the enrolled subject's admission to the labor and delivery unit using the electronic health records and regular contact with the OB/GYN service. Study personnel will determine if the subject still meets enrollment criteria after admission to labor and delivery (e.g., baby was carried to at least near full term (34 weeks and beyond) and delivered at either Lakeside Hospital and Clinic or Ochsner Baptist Medical Center). If the patient is still eligible for the study, the study personnel will liaise with bedside nursing to have the maternal research samples collected at the same time standard of care samples are being drawn.

Cord (i.e., fetal) blood, placental tissue, and the newborn naso-pharyngeal aspirate fluid will be collected as early as possible after delivery. All samples will undergo microbiological analyses using Enzyme-Linked Immunoassay (ELISA), Polymerase Chain Reaction (PCR) and CRISPR testing to identify evidence of previous or current infection.