Quantifying the risk of Mycobacterium avium subsp. paratuberculosis surviving pasteurisation

摘要

A risk analysis of Mycobacterium avium subsp. paratuberculosis (MAP) in milk harvested using good milking practice and treated in validated pasteurisers was carried out. We used the results from a survey of MAP in New Zealand raw milk silos in conjunction with data from our earlier kinetic study of the survival of MAP after high temperature-short time (HTST) pasteurisation, as well as data from two other published studies. Raw milk samples were collected at approximately weekly intervals over a 12-month period from raw milk silos at six dairy plants located throughout the major New Zealand dairying areas. One hundred and seventy five raw milk samples were forwarded chilled by overnight delivery to an accredited testing laboratory (AgResearch) for culturing. Over that period these samples represented a total volume of 4.6 million cubic metres of raw milk. One 50 ml aliquot was confirmed as being MAP culture-positive.