Cumulative incidence curves of the severe COVID-19 outcome in pregnant women, Clalit Health Services, December 20, 2020 through June 3, 2021. The main line is the point estimate of the cumulative incidence and the shaded areas are 95% confidence intervals. The vertical lines at days 28 and 77 demarcate the period in which an individual is considered ‘fully vaccinated’ in the manuscript (7 through 56 days after receipt of the second dose). The table below the curve presents the number at risk at each time point, along with the cumulative number of events. Each individual was included only once in each study group, but individuals could move from the unvaccinated group to the vaccinated group after receipt of the vaccine.