Respiratory syncytial virus seropositivity at birth is associated with adverse neonatal respiratory outcomes

• Published in: Pediatric pulmonology Vol. 55; no. 11; pp. 3074 - 3079
• Main Authors: Manti, Sara, Esper, Frank, Alejandro‐Rodriguez, Marilyn, Leonardi, Salvatore, Betta, Pasqua, Cuppari, Caterina, Lanzafame, Angela, Worley, Sarah, Salpietro, Carmelo, Perez, Miriam K., Rezaee, Fariba, Piedimonte, Giovanni
• Format: Journal Article
• Language: English
• Published: United States Wiley Subscription Services, Inc 01.11.2020
• Subjects: Antibodies, Viral - blood; epidemiology; Female; Fetal Blood - immunology; Humans; Immunoglobulin A - blood; Immunoglobulin G - blood; Immunoglobulin M - blood; Immunoglobulins; infant pulmonary function; Infant, Newborn; infections: pneumonia; Male; Maternal & child health; Newborn babies; Prenatal exposure; Respiratory syncytial virus; Respiratory Syncytial Virus, Human; Respiratory Tract Diseases - blood; Respiratory Tract Diseases - immunology; viral; Viral infections; epidemiology; viral; infections: pneumonia; infant pulmonary function; TB
• ISSN: 8755-6863; 1099-0496
• DOI: 10.1002/ppul.25001

Background More than 60 years since the discovery of the respiratory syncytial virus (RSV), the effects of prenatal exposure to this virus remain largely unknown. In this investigation, we sought to find evidence of RSV seroconversion in cord blood and explore its clinical implications for the newborn. Methods Offspring from 22 pregnant women with a history of viral respiratory infection during the third trimester of pregnancy (respiratory viral illness [RVI] group) and 40 controls were enrolled in this study between 1 September 2016 and 31 March 2019. Cord blood sera were tested for anti‐RSV antibodies by indirect fluorescent antibody assay. RSV seropositivity was defined as the presence of anti‐RSV immunoglobulin M (IgM) or immunoglobulin A (IgA), in addition to IgG in cord blood serum at ≥1:20 dilution. Results Anti‐RSV IgG was present in all cord blood serum samples from infants born to RVI mothers (95% confidence interval [CI] = 82%‐100%), with 16 samples also having elevated titers for either anti‐RSV IgA or IgM (73%; 95% CI = 52%‐87%). No controls had evidence of anti‐RSV antibodies. Eight (50%) seropositive newborns developed at least one respiratory tract finding, including respiratory distress syndrome (N = 8), respiratory failure (N = 3), and pneumonia (N = 1). RSV seropositive newborns also required more days on oxygen, had leukocytosis and elevated C‐reactive protein (P = .025, P = .047, and P < .001, respectively). Conclusion This study provides evidence of acute seropositivity against RSV in cord blood of newborns delivered from mothers with a history of upper respiratory tract illness in the third trimester. Cord blood seropositivity for anti‐RSV IgA or IgM was associated with adverse clinical and laboratory outcomes in newborns.