NS1 measurements in DF and DHF patients stratified by serotype and primary versus secondary infection. FoxAnnette Nguyen Minh HoaLe P. SimmonsCameron WolbersMarcel F. L. WertheimHeiman Thi KhuongPham Thi Hai NinhTran Thi Minh LienTrinh Thi LienNguyen Vu TrungNguyen Duc HienNguyen FarrarJeremy HorbyPeter R. TaylorWalter Van KinhNguyen 2011 <p>Plasma samples collected daily during admission and at follow-up from DF (pink) and DHF (blue) patients were tested by NS1 ELISA and results presented as OD<sub>450</sub> sample/OD<sub>450</sub> cutoff control.</p>