Up until 2011, the majority of pre-packaged whole chickens sold on the Irish market were packaged in a way that meant leakage of meat juices was relatively common. Typically the birds were sold on a tray with plastic wrapped around the meat and heat sealed under the tray. When condensation built up during chilled storage the seal was easily loosened and liquid could leak out through the bottom of the packaging. The change in poultry packaging was brought about by Irish evidence that Campylobacter could be found on the surface of the packaging.