Alliance for Pandemic Preparedness

May 26, 2020

Incidence, Clinical Outcomes, and Transmission Dynamics of Severe Coronavirus Disease 2019 in California and Washington: Prospective Cohort Study.

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  • Out of over 9 million healthcare plan enrollees in northern California, southern California, and Washington State, the cumulative incidence of first hospital admission for COVID-19 by April 22 was 15.6 per 100,000 persons in northern California, 23.3 per 100,000 persons in southern California, and 14.7 per 100,000 persons in Washington.  
  • Median duration of hospital stay was 9.3 days among survivors and 12.7 days among non-survivors. Probability of ICU admission was 48.5% for male patients and 32% for female patients and median duration of ICU stay was 10.6 days. 
  • Case fatality among admitted patients was 23.5% among male patients and 14.9% among female inpatients, with case fatality increasing by age for both sexes.  
  • The reproductive number declined during the study period in each region.  

Lewnard et al. (May 22, 2020). Incidence, Clinical Outcomes, and Transmission Dynamics of Severe Coronavirus Disease 2019 in California and Washington: Prospective Cohort Study. BMJ. https://doi.org/10.1136/bmj.m1923