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An Improved and High Throughput Respiratory Syncytial Virus RSV Micro-neutralization Assay
Published on: January 26, 2019
Reduced-Dose Schedule of Prophylaxis Based on Local Data Provides Near-Optimal Protection Against Respiratory
Daniel M Weinberger1, Joshua L Warren2, Claudia A Steiner3
1Department of Epidemiology of Microbial Disease.
Insights
A reduced 4-dose schedule for respiratory syncytial virus (RSV) prophylaxis, timed to local epidemics, offers protection comparable to 5 doses. This approach can enhance cost-effectiveness for infants at high risk of severe RSV infection.
Area of Science:
- Pediatric infectious diseases
- Epidemiology
- Public health interventions
Background:
- Respiratory syncytial virus (RSV) is a leading cause of respiratory illness in young children.
- High-risk infants receive monthly prophylactic monoclonal antibody injections during RSV season per national guidelines.
- This study evaluated a reduced-dose RSV prophylaxis schedule tailored to local epidemic timing.
Purpose of the Study:
- To determine if a reduced-dose RSV prophylaxis schedule provides adequate protection.
- To assess the feasibility of tailoring prophylaxis initiation to local RSV season timing.
- To improve the cost-effectiveness of RSV prevention strategies.
Main Methods:
- Analyzed hospitalization data from 1942 counties (1997-2009).
- Utilized a Bayesian change point model to identify RSV epidemic onset at county and state levels.
- Estimated coverage fractions for different prophylaxis initiation weeks.
Main Results:
- RSV epidemic onset timing varied significantly by locality.
- National prophylaxis initiation guidelines offered near-optimal season coverage.
- A 4-dose schedule with later initiation maintained near-optimal coverage (<5% decrease) in most areas.
- Optimal 4-dose initiation timing correlated with southern/eastern locations and higher population density.
Conclusions:
- A 4-dose RSV prophylaxis schedule aligned with local epidemics can achieve protection similar to 5 doses.
- This adjusted schedule offers a potential improvement in cost-effectiveness for RSV prevention.
- Tailoring prophylaxis timing to local RSV seasons warrants consideration for optimizing infant protection.
Background:
Respiratory syncytial virus (RSV) is a major cause of respiratory infections among young children and can lead to severe disease among some infants. Infants at high risk for severe RSV infection receive monthly injections of a prophylactic monoclonal antibody during the RSV season based on national guidelines. We considered whether a reduced-dose schedule tailored to the local RSV season in the continental United States would provide adequate protection.
Methods:
Hospitalization data for 1942 counties across 38 states from 1997 to 2009 were obtained from the State Inpatient Databases (Agency for Healthcare Research and Quality). We assessed the timing of RSV epidemics at the county and state levels using a 2-stage hierarchical Bayesian change point model. We used a simple summation approach to estimate the fraction of RSV cases that occur during the window of protection provided by initiating RSV prophylaxis during different weeks of the year.
Results:
The timing of RSV epidemic onset varied significantly at the local level. Nevertheless, the national recommendations for initiation of prophylaxis provided near-optimal coverage of the RSV season in most of the continental United States. Reducing from 5 to 4 monthly doses (with a later initiation) provides near-optimal coverage (<5% decrease in coverage) in most settings. Earlier optimal dates for initiating 4 doses of prophylaxis were associated with being farther south and east, higher population density, and having a higher percentage of the population that was black or Hispanic.
Conclusions:
A 4-dose schedule of prophylactic injections timed with local RSV epidemics could provide protection comparable to 5 doses and could be considered as a way to improve the cost-effectiveness of prophylaxis.
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