Late in 2010, up to 11,000 people were sickened by cryptosporidium in Ostersund, Sweden.

Today, The Local is reporting as many as 1,500 inhabitants in the municipality of Skellefteå in northern Sweden have confirmed in a survey that they have experienced stomach flu symptoms probably caused by a parasite outbreak.

Results from tests of water samples following the parasite infection could be completed on Wednesday.

The web survey conducted by Skellefteå and the Swedish Institute for Communicable Disease Control (Smittskyddsinstitutet – SMI) had been answered by 2,300 residents of the municipality by Wednesday lunchtime. Of those around 60 percent, 1,500 people, confirmed that they experienced stomach flu symptoms since April 1st.

Many complained of having had abdominal pain, diarrhea or gassy stomachs.
The survey has confirmed theories that the stomach flu has probably been caused by the parasite Cryptosporidium could have originated in the municipal water supply, local authorities confirmed at a press conference in Skellefteå on Wednesday.

SMI’s results on drinking water samples, expected at the latest on Thursday could be completed already Thursday afternoon.