Respiratory syncytial virus or influenza?

Area of Science:

• Epidemiology
• Virology
• Public Health

Background:

• Acute respiratory infections (ARIs) pose a significant health burden on the elderly population.
• Distinguishing the impact of different respiratory viruses, such as respiratory syncytial virus (RSV) and influenza, is critical for effective public health interventions.

Purpose of the Study:

• To compare the impact of RSV and influenza viruses on morbidity and mortality in the elderly over four winter seasons.
• To assess the role of integrated clinical and virological surveillance in understanding viral epidemics.

Main Methods:

• Analysis of clinical surveillance data for ARDs from sentinel general practitioners.
• Examination of virus isolate data for RSV and influenza A and B.
• Comparison with registered death data over four consecutive winters.

Main Results:

• A strong temporal correlation was observed between ARD incidence, deaths, and virus isolates.
• RSV and influenza viruses were identified as major contributors to excess deaths in the elderly.
• RSV's consistent end-of-year prevalence can mask its impact in multi-year analyses, unlike the more variable influenza epidemics.

Conclusions:

• RSV is as important as influenza viruses in causing morbidity and excess deaths among the elderly.
• Accurate interpretation of viral epidemics requires integrated clinical and virological surveillance.
• Public health strategies must account for the distinct epidemiological patterns of RSV and influenza.