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<blockquote data-quote="Lucky_P" data-source="post: 1253678" data-attributes="member: 12607"><p>Tons of current info here: johnes.org</p><p></p><p>Calves born to infected cows are infected <em>in utero</em> or via ingestion of organisms passed in colostrum/milk - and from fecal material containing the bacteria - 'clinical' cows may be seeding 60 million organisms per day into the environment. In a beef herd, calves born to an infected dam are 10X more likely to be infected than herdmates born to noninfected cows...but all are at risk, due to fecal contamination. We generally recommend NOT keeping offspring born to known infected dams.</p><p>Resistance to infection increases as animals get older, but with massive or constant exposure, even older animals may become infected.</p><p></p><p>Routine pasteurization is <u>not</u> effective in killing the Johne's organism in milk. It can - and has been - cultured from milk off the grocery store shelves. Lab experiments where they 'spiked' milk samples and then pasteurized them showed no significant decrease in bacterial colony counts of<em> M.avium subsp. paratuberculosis </em>(MAP).</p><p>Pasteurization temps/times are established to kill important human pathogens; <em>Coxiella burnetti</em>, specifically. Due to its thick waxy cell wall, MAP survives routine pasteurization.</p><p>At this point, the connection between MAP and Crohn's Disease in humans is unproven...but there are some aspects of the correlation that seem plausible.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1253678, member: 12607"] Tons of current info here: johnes.org Calves born to infected cows are infected [i]in utero[/i] or via ingestion of organisms passed in colostrum/milk - and from fecal material containing the bacteria - 'clinical' cows may be seeding 60 million organisms per day into the environment. In a beef herd, calves born to an infected dam are 10X more likely to be infected than herdmates born to noninfected cows...but all are at risk, due to fecal contamination. We generally recommend NOT keeping offspring born to known infected dams. Resistance to infection increases as animals get older, but with massive or constant exposure, even older animals may become infected. Routine pasteurization is [u]not[/u] effective in killing the Johne's organism in milk. It can - and has been - cultured from milk off the grocery store shelves. Lab experiments where they 'spiked' milk samples and then pasteurized them showed no significant decrease in bacterial colony counts of[i] M.avium subsp. paratuberculosis [/i](MAP). Pasteurization temps/times are established to kill important human pathogens; [i]Coxiella burnetti[/i], specifically. Due to its thick waxy cell wall, MAP survives routine pasteurization. At this point, the connection between MAP and Crohn's Disease in humans is unproven...but there are some aspects of the correlation that seem plausible. [/QUOTE]
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