Adenovirus F40/F41, DNA, Real-Time PCR (Stool)

The Adenovirus F40/F41, DNA, Real-Time PCR (Stool) test detects human adenovirus (HAdV) group F serotypes 40/41 in stool to aid in diagnosing adenoviral gastroenteritis. This molecular assay targets enteric adenovirus DNA and is used in conjunction with clinical assessment and other laboratory studies; it is not designed for monitoring treatment response or clearance.

Human adenoviruses are nonenveloped DNA viruses in the family Adenoviridae. More than 68 serotypes are organized into seven species (A–G) and are linked to diverse syndromes, including acute respiratory illness, conjunctivitis, hemorrhagic cystitis, and gastroenteritis. Adenovirus accounts for approximately 4%–12% of viral gastroenteritis cases and ranks second to rotavirus. Disease occurs most often in children younger than two years, though adolescents and adults may be affected; severe manifestations can develop in immunocompromised individuals (eg, after stem cell transplantation or with AIDS). Clinical disease correlates with serotype. The enteric types F40 and F41 are associated with gastroenteritis, whereas other serotypes such as C1 and B7 are typically linked to respiratory disease. Diagnostic approaches include electron microscopy (broad detection but limited sensitivity), viral culture (slow and particularly challenging for F40/F41), antigen detection by immunoassay or latex agglutination (rapid and specific but less sensitive), and nucleic acid–based methods. Real-time PCR performed on stool provides high analytical sensitivity and specificity for adenoviral DNA when primers target serotypes F40/F41. Quantitative formats can estimate viral load for epidemiologic applications. Limitations include persistence of detectable nucleic acid after effective therapy, making the assay unsuitable for treatment monitoring. Sensitivity is greatest when specimens are collected before initiation of antiviral therapy. Results require interpretation in the context of clinical findings and adjunct laboratory data.