FilmArray® Effectively Detects All Clades of F41 but Encounters Challenges with Other Adenovirus Species.

The BioFire FilmArray® Gastrointestinal (GI) Panel, a widely used diagnostic tool, is designed to detect the genetic material of 22 common pathogens responsible for gastroenteritis, including viruses, bacteria, and parasites. It can detect human adenovirus (HAdV) species F, particularly serotypes F40 and F41, which are the major causes of diarrhea and mortality in children. However, its potential shortcomings in detecting other HAdV species limit its effectiveness in broader HAdV detection in clinical settings and outbreak investigations. The aim of this study was to evaluate the ability of the GI Panel to detect three clades of HAdV-F41 and other HAdV species (viz., A31, B3, C1, C2, C5, C2/6, and D56) in Japan. Eighteen stool samples were analyzed, five of which contained HAdV-F41, and 13 contained other HAdV species, as confirmed via PCR and sequencing. Although the GI Panel reliably detected all clades of HAdV-F41, it failed to detect any other species, highlighting its limited diagnostic utility beyond F40/41 serotypes. Considering the high false-negative rate for non-F40/41 species, integrating complementary diagnostic methods such as PCR is crucial for comprehensive HAdV detection. These findings underscore the limitations of the GI Panel in detecting non-F40/41 species, such as HAdV-C (commonly associated with pediatric gastroenteritis) and other species that are important in immunocompromised patients. Complementary diagnostic methods, such as PCR or immunochromatographic assays, are essential to ensure accurate HAdV detection, especially in vulnerable populations.