According to the World Health Organization (WHO), chronic obstructive pulmonary disease (COPD) is the third leading cause of ...

Background: Chronic obstructive pulmonary disease (COPD) is characterised by both an accelerated decline in lung function and periods of acute deterioration in symptoms termed exacerbations. The aim ...

In patients with COVID-19, preexisting immunity and Omicron infection were associated with reduced disease severity and upper respiratory symptom presentation.