COVID-19 Not Linked to Increased Risk of Subsequent URTIs in Adults

Overview

A prospective cohort study of 320 healthcare workers found no significant association between prior COVID-19 infection and the incidence of subsequent upper respiratory tract infections (URTIs). However, having young children under 5 years old in the household was associated with a substantially increased risk of URTIs.

Background

Upper respiratory tract infections (URTIs) are common and cause significant morbidity worldwide. During the COVID-19 pandemic, nonpharmaceutical interventions reduced the circulation of other respiratory viruses, but a surge in URTIs was observed in Autumn 2022. There has been speculation that prior SARS-CoV-2 infection might increase susceptibility to other respiratory infections due to immune system effects or microbiome disruption, but data in adults remain scarce. This study aimed to clarify whether COVID-19 increases the risk of subsequent URTIs in adults.

Data Highlights

Key Findings

• No significant increase in URTI incidence was observed following COVID-19 infection (HR 1.03; 95% CI 0.74–1.43; P = .87).
• Having at least one child under 5 years old in the household was associated with a 74% increased risk of URTI (P = .003).
• The study included 320 healthcare workers with a median follow-up of 342 days.
• Nearly half (47.5%) of participants tested positive for SARS-CoV-2 during the study period.
• Sensitivity analyses confirmed the robustness of the findings.

Clinical Implications

Clinicians can reassure adult patients that prior COVID-19 infection does not appear to increase their risk of subsequent upper respiratory tract infections. Attention should be given to other risk factors such as household exposure to young children, which significantly increases URTI risk. These findings suggest that the recent surge in URTIs may be driven by epidemiological and social factors rather than direct effects of COVID-19.

Conclusion

This prospective cohort study found no evidence that COVID-19 increases the risk of subsequent URTIs in adults. Other factors, including exposure to young children, likely contribute more substantially to URTI incidence.

References

1. RECOVER Study Group 2023 -- Evaluating the Link Between COVID-19 and the Risk of Subsequent Upper Respiratory Tract Infections in Adults