⚠️88% ASYMPTOMATIC!!! An unusual universal screening of all pregnant mothers entering NYC hospital— yielded vast majority of #SARSCoV2 positive cases had no symptoms. Very troubling if this is the trend in gen pop too - at least 10x undercount. #COVID19 nejm.org/doi/full/10.10… 
2) Nasopharyngeal swabs were obtained from 210 of the 211 women (99.5%) who did not have symptoms; of these women, 29 (13.7%) were positive for SARS-CoV-2. Thus, 29 of the 33 patients who were positive at admission (87.9%) had no symptoms of #Covid19 at presentation ~ 88%
3) 📌Of 29 women asymptomatic but who were positive on admission, fever developed in 3 (10%) before postpartum discharge.
📌One patient w/ a swab that was negative on admission became symptomatic postpartum; repeat testing 3 days after initial test was *positive* #COVID19
📌One patient w/ a swab that was negative on admission became symptomatic postpartum; repeat testing 3 days after initial test was *positive* #COVID19
4) for clarification- Up until recently always-asymptomatic and pre-symptomatic asymptomatic were lumped together. And empirically we can’t tell the difference cross sectional lu without longitudinal follow up. Agree it’s important to late figure out.
5) Math for the 88%:
13.5 + 1.9 = 15.4
13.5/15.4 = 87.6%
13.5 + 1.9 = 15.4
13.5/15.4 = 87.6%
