Respiratory syncytial virus testing capabilities and practices among National Respiratory and Enteric Virus Surveillance System laboratories, United States, 2016.

BACKGROUND:Laboratory tests to detect respiratory syncytial virus (RSV) vary in sensitivity and specificity. Diagnostic testing practices can impact RSV disease diagnosis and burden estimates. OBJECTIVES:We surveyed a sample of laboratories that participated in the National Respiratory and Enteric Virus Surveillance System (NREVSS) in 2015-2016 to understand RSV testing, diagnostic capabilities, and practices. STUDY DESIGN:We distributed surveys in fall 2016 to NREVSS laboratories using an internet survey platform. We conducted a descriptive analysis of survey responses and stratified results by self-identified children's hospital laboratories (CHL, i.e. laboratories affiliated with or in a children's hospital) or general hospital laboratories (GHL, i.e. laboratories that performed analysis on specimens from only adults or adults and children). RESULTS:We sampled 367 (82.5%) of 445 eligible NREVSS laboratories with a 35.7% response rate; 11.5% (n = 15) were CHLs. All CHLs had PCR-based assay capability to test for RSV compared to 48.7% of GHLs (p < 0.001), and it was the most frequent method used by CHLs (n = 9, 75.0%). GHLs used rapid antigen detection tests most frequently (n = 65, 60.2%) to detect RSV compared to CHLs (p = 0.02, n = 3, 25.0%). Almost half (n = 41, 48.2%) of GHLs reported specimen submission from adults ≥50 years for RADTs. CONCLUSIONS:Laboratory testing and diagnostic capabilities differed by whether laboratories self-identified as a CHL or GHL. Many GHLs reported use of RADTs in adults ≥50 years, a less sensitive diagnostic method for this population compared to PCR-based assays. RADT use in adults might miss RSV cases and affect diagnoses and disease burden estimates.