An announcement from Purdue on regional mosquito increases that can
increase the heartworm risk.
http://media-newswire.com/release_1068942.html

Heartworm in ferrets: http://www.miamiferret.org/fhc/heartworm.htm

Heartworm prevention: http://ferrethealth.org/archive/FHL5195

Where heartworm has been documented in the U.S. *though the risk is
definitely also in other nations*:
http://www.heartwormsociety.org/download/incidencemap.jpg

Sukie (not a vet)

Recommended ferret health links:
http://pets.groups.yahoo.com/group/ferrethealth/
http://ferrethealth.org/archive/
http://www.afip.org/ferrets/index.html
http://www.miamiferret.org/fhc/
http://www.ferretcongress.org/
http://www.trifl.org/index.shtml
http://homepage.mac.com/sukie/sukiesferretlinks.html

[Posted in FML 6040]