MOUNT VERNON, Wash. (AP) — It’s been just over a year since a choir practice in Skagit County became one of the nation’s first-known COVID-19 superspreader events.

The outbreak sickened 53 people and killed two.

But from that tragedy emerged important research on how the virus was transmitted.

Experts say the public health investigation into the rehearsal was key in determining that the virus was spreading through the air.

The children of one of the two women who died gathered recently to honor her and say it brings them comfort to know that studies of the event have helped save lives.