Parental Socioeconomic Status and an Infant's Risk of Hospital Admission for Respiratory Syncytial Virus.

Background: While clinical risk factors for respiratory syncytial virus (RSV) bronchiolitis are well established, data on socioeconomic risk factors is lacking. We explored the association of parental education, income, and employment status on an infant's risk of hospitalization for RSV bronchiolitis.

Methods: This population-based retrospective case-control study covered all RSV-related hospital admissions of under 1-year-old children in Finland between 2004 and 2018. Controls were matched by month and year of birth, sex, province of residence, and family size. Registry data were linked using unique personal identity codes. Cases and controls were compared using adjusted odds ratios (aOR) calculated for socioeconomic outcomes including maternal and paternal education, household income, and parental employment.

Results: A total of 10 767 infants and 50 054 controls were included in the study. Lower parental education significantly raised the risk for RSV hospital admission in infants, the risk growing with decreasing education levels; aOR 1.03 (0.96-1.09) with post-secondary education, 1.12 (1.05-1.2) with secondary education, and 1.33 (1.2-1.47) with primary education. Combined parental income was not significant: aOR 0.97 (confidence interval [CI] 0.91-1.05), 1.02 (CI 0.95-1.1), 1 (CI 0.92-1.08), and 0.94 (CI 0.85-1.04), respectively with decreasing income level. Unemployment of both parents seemed to be a risk factor for the child's RSV hospital admission, aOR 1.24 (1.12-1.38).

Conclusions: Lower parental socioeconomic status may increase the risk of an infant's RSV hospitalization. Socioeconomic risk factors should be considered when designing RSV infection primary prevention strategies.