The HSE has launched a probe after the mid-west region saw an increase in the presence of E.Coli.
The Mid-West region, which covers Limerick, Clare and North Tipperary, issued the alert on Monday afternoon, warning people of the severe symptoms associated with the virus.
A spokesperson said: "We would like to emphasise the importance of the effective treatment of private well water and washing hands, following a noticeable increase in Verotoxigenic E. Coli (VTEC) cases and outbreaks in the region in recent weeks."
