What is metagenomic sequencing's role in rapid diagnostics?

• A. Is faster than all other molecular tests
• B. Detects pathogens and resistance genes directly from clinical samples
• C. Only detects viruses
• D. Replaces all culture tests

Answer: (B)

Metagenomic sequencing reads all genetic material in a clinical sample and analyzes it to identify any microbial DNA or RNA present, as well as known antimicrobial resistance genes. This approach enables direct, broad-spectrum detection of pathogens without the need for culture or targeted assays, capturing bacteria, viruses, fungi, and parasites, along with resistance determinants embedded in those organisms. That comprehensive, direct view of who is there and what resistance potential they carry is why this option is the best choice: it provides rapid, unbiased information from the sample itself to guide treatment decisions. It isn’t guaranteed to be faster than every other molecular test, since sequencing workflows involve library prep, sequencing time, and data analysis, and some targeted tests can yield quicker results in specific contexts. It does not detect only viruses, because it is non-targeted and can identify a wide range of pathogens. It also does not replace culture tests entirely, since phenotypic susceptibility testing and validation often require viable isolates and additional workflows beyond what sequencing alone provides.