The health board in West Central Scotland is investigating seven cases of E. coli O157 possibly linked to burgers from the SSE Hydro arena in Glasgow. The NHS Greater Glasgow and Clyde (NHSGGC) issued a statement Friday alerting anyone who attended events at the Hydro between Jan. 17 and Jan. 25 and has experienced stomach cramps, diarrhea, nausea and fever to contact their doctor. “All seven cases are recovering at home,” read the statement. “One of the cases is from the NHSGGC area, two are from the NHS Lanarkshire area, three from NHS Lothian and one is from Cumbria.” The Public Health Protection Unit of NHSGGC is working with other health boards, Health Protection Scotland, the Food Standards Agency and Glasgow City Council Environmental Health to investigate the source of the outbreak and ensure that Hydro vendors are following proper food hygiene standards.