After confirming Seoul virus infection in the Wisconsin patients, CDC and WDHS
initiated investigations into rat shipments to (trace-back) and from (trace-forward) the rattery to identify suspected and confirmed facilities.
On April 1, WDHS and MDH issued advisories to alert regional health care organizations, local public health agencies, and tribal health departments to the situation and launched a joint investigation on April 4.
During April-July 2016, WDHS and MDH attempted telephone interviews with workers.
Not all exposed workers and household members were tested for lead, and not every BLL test result might have been reported to WDHS or MDH.
WDHS abstracted patient information for persons who were present at the event and subsequently sought care at four area EDs.
In February 2015, WDHS mailed a survey to ED patients whose records had been abstracted to verify smoking status and to gather additional information on symptoms and sequelae.
Census, and WDHS hospital discharge data, personal communication, February 2009).
* WDHS, Division of Public Health, Report of Fetal Death, standard form DPH 5042.