A deadly cluster grows

Rates of anencephaly in Yakima, Benton and Franklin counties have spiked since 2010, compared with the rest of Washington state.

Cases by county: 41 total

(2010 - 2015)

Cases by year

(for Yakima, Benton and Franklin counties) As many as nine pregnancies a year have been affected by anencephaly during the cluster.

Source: Washington State Department of Health

MARK NOWLIN / THE SEATTLE TIMES