Investigators trying to track down an outbreak of e-coli say they’ve made progress in indentifying the source of contaminated meat.

Four of eight known cases have been linked to the consumption of Kirkland brand strip loin from an Edmonton Costco.

The packages were purchased September 4th and it’s unclear as to how many steaks were sold at the Edmonton store.

One of the people affected had saved the steak in their freezer.

Alberta Health Services says they’re still looking for the exact source of e-coli, but investigators add they do have some concerns about a needle process the store uses to tenderize meat.

Medical officer Dr. Gerry Predy could only say there was more than one package involved.

“We think we’ve taken the proper precautions. We’re hopeful that we won’t see anymore, but again, we can’t speculate, because people do buy product, keep it in their freezer,” he says.

In the meantime, officials continue to try and find the source of Calgary’s three cases of contamination.

Alberta’s Chief Medical Officer of Health Dr. James Talbot tells 660News there’s no reason to be afraid of Alberta beef.

He says fewer that one tenth of e-coli outbreaks are related to contaminated meat.

Dr. Talbot explains in the last three to five years, the amount of e-coli cases has reduced significantly.