This letter to the editor presents results from a universal COVID-19 testing program implemented to all pregnant women who were admitted for delivery between March 22 and April 4, 2020 at New York–Presbyterian Allen Hospital and Columbia University Irving Medical Center. They found that most the patients (29 of 33; 87.9%) who were positive for SARS-CoV-2 at delivery were asymptomatic.

The program screened a total of 215 pregnant women on admission for symptoms of Covid-19. Of these women:

• 4 (1.9%) had fever or other symptoms of Covid-19 on admission, and all 4 women tested positive for SARS-CoV-2.
• 211 women did not have symptoms, all of these women were afebrile on admission.

Nasopharyngeal swabs were obtained from 210 of the 211 women (99.5%) who did not have symptoms of Covid-19; of these women, 29 (13.7%) were positive for SARS-CoV-2.

Of the 29 women who had been asymptomatic but who were positive for SARS-CoV-2 on admission, 3 (10%) developed fever before postpartum discharge (median length of stay, 2 days).