7. Where, as a result of his examination, the official veterinary surgeon is satisfied that a part of the carcase or offal derived from an animal is affected by a slight localised infestation by a parasite not transmissible to man but that the remainder of the carcase or offal as the case may be is fit for human consumption, an official veterinary surgeon or an inspector may, if he thinks fit, remove the parasite and trim the surrounding part and shall direct that the trimmings shall not be sold for human consumption.