Clark County’s measles outbreak of 71 confirmed cases was declared over by Clark County Public Health Monday, after six weeks elapsed with no new confirmed cases.

The outbreak required two incubation periods, or 42 days, with no new cases before Clark County Public Health Director Dr. Alan Melnick would declare it over. The last confirmed case was March 18.

The first confirmed case came through testing on Jan. 3 of a child who traveled to Clark County from Ukraine. Public Health’s investigation was never able to determine whether that case sparked the outbreak, according to a Public Health news release.

There had been 73 confirmed cases, but two patients moved to the state of Georgia during the outbreak, and will now count toward Georgia’s caseload. Clark County’s outbreak doesn’t include one case in King County and four in Multnomah County that were linked to Clark County’s outbreak.

The outbreak cost Public Health $864,679, but $80,000 of that is covered by grant funds, and the state Legislature has appropriated $744,000 to reimburse the county for outbreak response. Melnick said Clark County’s out-of-pocket cost should be around $40,000.