Virus-associated pulmonary aspergillosis: A rising challenge in respiratory infections

Invasive Aspergillosis (IA) is a severe fungal infection primarily caused by Aspergillus species, notably Aspergillus fumigatus. However, newly emerging species, some exhibiting antifungal resistance, are becoming increasingly common. IA mainly affects immunocompromised individuals, including those with hematological malignancies and solid organ transplant recipients. In recent years, however, new at-risk populations have been identified, regardless of immune status, particularly those with severe viral infections requiring intensive care unit admission. This condition has gained prominence in intensive care unit settings following the recent H1N1 influenza and COVID-19 pandemics. Virus-associated pulmonary Aspergillosis (VAPA) encompasses two distinct entities: influenza-associated pulmonary Aspergillosis (IAPA) and COVID-19-associated pulmonary Aspergillosis (CAPA). These conditions are typically diagnosed in 10-20% of patients with severe influenza or COVID-19 when appropriate diagnostic methods are employed. Key diagnostic tools include bronchoalveolar lavage for fungal culture, galactomannan testing, and Aspergillus PCR, complemented by bronchoscopy to detect invasive Aspergillus tracheobronchitis visually. Azole antifungals are the first-line treatment, with liposomal amphotericin B serving as an alternative in regions with azole resistance. Despite antifungal interventions, IAPA and CAPA are linked to poor outcomes, with fatality rates often surpassing 50%. This review article discusses the pathophysiological mechanisms, clinical characteristics, diagnosis, and treatment of IAPA and CAPA. Additionally, it highlights key knowledge gaps and suggests potential areas for future research.