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RE: RC: Strangles
In a message dated Mon, 7 May 2001 11:11:35 AM Eastern Daylight Time, "Kathy Mayeda" <email@example.com> writes:
<< Heidi, if you read the article again, Dr. O says that they lose their
immunity over time "perhaps as short as 2 years."
He is not disagreeing with you. >>
Here is his quote:
<1) There is no doubt that experimentally Strangles horses loose their
immunity over time, perhaps as short as 2 years. Experience suggests in the
real world a longer lasting immunity, some think life time. I have seen
horses in the middle of outbreak surrounded by sick horses that remained
free of the disease but had no history of prior infection or vaccination.
Then again I had not know the horses that well.>
So, he is citing experimental cases having waning immunities, but suggesting that it may be different in real life. I am suggesting that real life is indeed similar to the experimental cases. It sounds here as if he is quoting others and not really expressing a clear-cut opinion from his own experience. I know from my own experience as well as from the experiences of others that the immunity is not lifetime, and I haven't talked to anyone active in the field of immunology that still holds that belief, either. Regarding horses that do not get sick in a given outbreak--they may or may not be immune, as all diseases have a pattern of "morbidity" (the number that get sick) and it is rarely 100% for any disease. I can't cite precise morbidity figures for strangles, but although it has a high morbidity, it does not approach 100%. This doesn't mean that the horses who stay well necessarily have an immunity from a previous exposure. While Dr. O does not come right out and say !
that they do, he is inferring th
at he thinks they might.
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