Respiratory Syncytial Virus Infection Among Hospitalized Infants in Four Middle-Income Countries

• Published in: Journal of the Pediatric Infectious Diseases Society Vol. 12; no. 7; pp. 394 - 405
• Main Authors: Biggs, Holly M, Simões, Eric A F, Abu Khader, Ilham, Thompson, Mark G, Gordon, Aubree, Hunt, Danielle R, DeGroote, Nicholas P, Porter, Rachael M, Bino, Silvia, Marar, Basima I, Gresh, Lionel, de Jesus-Cornejo, Joanne, Langley, Gayle, Thornburg, Natalie J, Peret, Teresa C T, Whitaker, Brett, Zhang, Yange, Wang, Lijuan, Patel, Mira C, McMorrow, Meredith, Campbell, William, Hasibra, Iris, Duka, Enkeleda, Al-Gazo, Mahmoud, Kubale, John, Sanchez, Felix, Lucero, Marilla G, Tallo, Veronica L, Azziz-Baumgartner, Eduardo, Simaku, Artan, Gerber, Susan I
• Format: Journal Article
• Language: English
• Published: US Oxford University Press 31.07.2023
• Subjects: Acute Disease; Aftercare; Developing Countries; Female; Hospitalization; Humans; Infant; Infant, Newborn; Male; Patient Discharge; Premature Birth; Respiratory Syncytial Virus Infections; Respiratory Syncytial Virus, Human; global health; Nicaragua; Respiratory syncytial virus; pneumonia; Philippines; infant; Jordan; Pediatric; bronchiolitis; Albania
• ISSN: 2048-7207; 2048-7193; 2048-7207
• DOI: 10.1093/jpids/piad042

Abstract Background Understanding respiratory syncytial virus (RSV) global epidemiology is important to inform future prevention strategies. Methods Hospitalized infants <1-year-old with acute illness were enrolled prospectively in Albania, Jordan, Nicaragua, and Philippines during respiratory seasons in 2015–2017. Medical chart review, parental interview, and post-discharge follow up were conducted. Respiratory specimens were tested using real-time RT-PCR for RSV. Infant characteristics associated with very severe illness (intensive care unit [ICU] admission or receipt of supplemental oxygen) were assessed using logistic regression to adjust for potential confounders (age, sex, study site, and preterm birth). Results Of 3634 enrolled hospitalized infants, 1129 (31%) tested positive for RSV. The median age of RSV-positive infants was 2.7 (IQR: 1.4–6.1) months and 665 (59%) were male. Very severe illness in 583 (52%) RSV-positive infants was associated with younger age (aOR 4.1, 95% CI: 2.6–6.5 for 0–2 compared to 9–11-months; P < .01), low weight-for-age z-score (aOR 1.9, 95% CI: 1.2–2.8; P < .01), ICU care after birth (aOR 1.6, 95% CI: 1.0–2.5; P = .048), and cesarean delivery (aOR 1.4, 95% CI: 1.0–1.8; P = .03). RSV subgroups A and B co-circulated at all sites with alternating predominance by year; subgroup was not associated with severity (aOR 1.0, 95% CI: 0.8–1.4). Nine (0.8%) RSV-positive infants died during admission or within ≤30 days of discharge, of which 7 (78%) were <6-months-old. Conclusions RSV was associated with nearly a third of infant acute illness hospitalizations in four middle-income countries during the respiratory season, where, in addition to young age, factors including low weight-for-age might be important predictors of severity. RSV prevention strategies targeting young infants could substantially reduce RSV-associated hospitalizations in middle-income countries.