Molecular and Epidemiological Characterization of Seasonal Common Cold Viruses and Host Immune Responses in Symptomatic Patients

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Background: Seasonal respiratory viral infections continue to be a significant public health burden worldwide, accounting for a substantial proportion of outpatient visits, absenteeism, and healthcare expenditures.Human rhinoviruses, coronaviruses, adenoviruses, and respiratory syncytial virus (RSV) account for the majority of common cold cases, yet their molecular diversity and host immune interactions complicate prevention and management strategies.Objective: This study aimed to characterize circulating common cold viruses during seasonal outbreaks, evaluate transmission dynamics, investigate viral pathogenicity, and analyze host immune responses in symptomatic patients using molecular diagnostic approaches.Methods: A cross-sectional clinical study was conducted across multiple seasons.Nasopharyngeal samples from patients presenting with acute respiratory symptoms were analyzed using RT-PCR and multiplex PCR assays for viral identification.Viral load, pathogenicity markers, and host immune parameters including interferons, cytokines, antibody titers, and T-cell responses were quantified.Epidemiological and environmental variables were correlated with clinical severity.Results: Rhinoviruses represented the predominant viral pathogen, followed by coronaviruses, adenoviruses, and RSV.Viral prevalence peaked during winter months and showed significant associations with ambient temperature and humidity.Elevated viral loads correlated positively with pro-inflammatory cytokines (IL-6, TNFα) and symptom severity, while stronger adaptive immune responses were associated with improved clinical outcomes.Molecular analyses revealed substantial genetic variability, particularly within rhinovirus capsid proteins, contributing to immune evasion and enhanced transmissibility.Conclusion: Seasonal common cold outbreaks are driven primarily by rhinoviruses exhibiting high replication capacity and genetic diversity.Clinical severity is determined by the interplay between viral load and host immune responses.These findings emphasize the importance of molecular surveillance, optimized diagnostic timing, and immune-modulatory therapeutic strategies to improve patient management in clinical pharmacy practice.