If Salmonella enteritidis is found in the environment of commercial pullet grower flocks, 60 birds shall be cultured according to the procedures set forth in section 57.8(c) of this Part. Said birds shall be selected at random. If the organ cultures are negative, reevaluate the flocks by selecting an additional 60 birds in a random pattern throughout the houses and culturing the organs as provided for in section 57.8(c) of this Part. If organ cultures continue to be negative, the flocks shall revert to negative status. No additional birds shall be placed in the houses until the houses have been cleaned and disinfected and the environments have been tested and found negative for Salmonella enteritidis. If the organ cultures are positive for Salmonella enteritidis, the flocks shall be considered infected and shall either be depopulated or all future egg production shall be sent to a breaking plant for pasteurization.