Officials in Canterbury, New Zealand issue warnings on September 5, 2011 advising the public not to collect or consume shellfish from water bodies around the Avon-Heathcote Estuary, where extremely high levels of harmful Norovirus have been detected.

http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10749727&ref=rss
http://www.stuff.co.nz/the-press/news/5567490/Extreme-norovirus-risk-from-Estuary-shellfish