Re:Coronavirus clue? Most cases aboard U.S. aircraft carrier...
by ineedasername on Thursday April 16, 2020 @10:30PM
(#22895677)
Immune systems during pregnancy are vastly different than normal. It's quite possible that is a factor in the asymptomatic rate here. Many studies like this are using populations with inherent selection bias: that makes them interesting, for that population, but you cannot generalize from those results.
29 out of 33 pregnant women who tested positive at Columbia University Medical in NYC were also asymptomatic:
https://www.medpagetoday.com/infectiousdisease/covid19/85965
With other viruses, pregnant women are typically considered at elevated risk. For example, they had a significantly higher fatality rate with the Spanish Flu. So it's still unclear who is most likely to be asymptomatic based on the data we have so far.