Single nanoparticle analysis-based CRISPR/Cas12 bioassay for amplification-free HIV detection.

To reduce the "window period" in HIV detection, most analytical methods require additional enzymes for signal amplification. Exempting challenges like primer interference and false positives in amplification strategies, we developed an amplification-free bioassay that uses CRISPR's potent cleavage activity and the competent sensitivity of single-nanoparticle analysis. An attomolar detection limit was achieved with adequate selectivity. Serum and cell tests confirm the bioassay's accurate and sensitive HIV detection.