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Respiratory Viral Infections Research / Data Driven Disease Surveillance / Pneumonia and Respiratory Infections · Journal article
Pathogens · August 31, 2026
Reinforces what was already believed, rather than introducing something new.
This eight-year retrospective study documents substantial shifts in respiratory virus detection patterns across the COVID-19 era at a tertiary Saudi center. SARS-CoV-2 dominated during lockdown and restriction periods (97.4% and 93.2% respectively), whereas pre-pandemic detections were primarily Influenza A (71.1%). The post-restriction period showed re-diversification with RSV prominence (28.3%). Age and virus type were associated with length of stay in adults, but not independently in children after adjustment.
Retrospective observational cohort study. All patients with PCR-confirmed detections for SARS-CoV-2, Influenza A, Influenza B, RSV, or HMPV at King Khalid University Hospital, Riyadh, Saudi Arabia between October 2017 and December 2025.. n = 5,708. King Khalid University Hospital, Riyadh, Saudi Arabia.
SARS-CoV-2 accounted for 52.5% of all 5708 confirmed detections across the eight-year period Before pandemic, Influenza A represented 71.1% of detected episodes; during lockdown era, SARS-CoV-2 rose to 97.4% During restriction era, SARS-CoV-2 accounted for 93.2% of detections; post-restriction era showed RSV at 28.3%
Study does not report disease severity, clinical outcomes, or mortality; LOS as proxy for severity may be confounded by admission criteria and resource availability
This study reinforces the need for continued surveillance of respiratory virus epidemiology in the post-pandemic period, particularly as patterns re-diversify. Clinicians should remain alert to age-dependent viral prevalence (RSV/HMPV in young children, SARS-CoV-2 in older adults) and consider virus type when predicting length of hospitalization in adult patients.
Retrospective observational study documenting established epidemiological patterns of respiratory viruses across defined time periods; confirms known shifts in viral detection during COVID-19 pandemic but uses descriptive methods without novel intervention or causal inference.
As stated by the source record.
Quoted from the source exactly as published.
This study reinforces the need for continued surveillance of respiratory virus epidemiology in the post-pandemic period, particularly as patterns re-diversify. Clinicians should remain alert to age-dependent viral prevalence (RSV/HMPV in young children, SARS-CoV-2 in older adults) and consider virus type when predicting length of hospitalization in adult patients.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Background: Respiratory tract infections (RTIs) caused by viruses are a public health problem, contributing to hospital admissions and morbidity worldwide. The COVID-19 pandemic substantially altered the detection patterns of respiratory viruses through public health interventions. Longitudinal data on these changes and viral seasonality remain limited in Saudi Arabia. This eight-year study evaluated epidemiological and seasonal patterns of major respiratory viruses across the COVID-19 era at a major Saudi tertiary care center. Methods: A retrospective observational study was conducted at King Khalid University Hospital, Riyadh, from October 2017 to December 2025. PCR-confirmed detections for SARS-CoV-2, Influenza A, Influenza B, respiratory syncytial virus (RSV), and human metapneumovirus (HMPV) were extracted from the hospital Laboratory Information System. Demographics, co-detection, seasonality, and length of stay (LOS) were analyzed across four eras spanning the pre-COVID-19, lockdown, restriction, and post-restriction periods using descriptive statistics, the Kruskal–Wallis test, and multivariable negative binomial regression. Results: Among 5708 confirmed respiratory viral detection episodes, SARS-CoV-2 was the most frequently detected (52.5%), followed by Influenza A (19.1%), RSV (16.4%), Influenza B (8.4%), and HMPV (3.6%). Before the pandemic, Influenza A accounted for the largest proportion of detected episodes (71.1%), with detections clustering particularly during autumn and winter seasons, whereas SARS-CoV-2 accounted for the majority of detected episodes during the lockdown and restriction eras (97.4% and 93.2%). The post-restriction era became more diverse, with RSV being detected in substantial proportions (28.3%), showing prominent winter activity. RSV and HMPV predominantly affected children aged 0–5 years, whereas SARS-CoV-2 was more frequently detected among older adults. Among adults, older age was associated with prolonged LOS; Influenza A and HMPV were associated with shorter stays compared to SARS-CoV-2. Among children, no virus was independently associated with LOS after adjustment for age and sex; however, older age was associated with longer hospital stays. Conclusion: The observed detection patterns of major respiratory viruses shifted substantially across the COVID-19 eras, with notable post-restriction diversification among observed positive detections. LOS was associated with age in both adults and children and with virus type among adults, supporting continued surveillance to guide preventive and clinical strategies.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.