Contractors continue to trap, band and remove broods of common mergansers on 5 lakes in Michigan. To date, 310 common mergansers have been removed. The goal is to remove all broods from the lakes by the end of July. Removal of all broods will greatly reduce the infection rate of the snails, and therefore the levels of cercarie (the free-swimming laraval stage of the parasite), which are the cause of swimmer's itch in humans. Snails that were infected last year will still be "shedding" the cercarie this summer. Removal of the merganser broods this summer will reduce the likelihood of contracting swimmer's itch next year.