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Discussion on Texas Equine Piroplasmosis Situation as of Dec 21 2009
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Moderator:
DrO
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Posted on Wednesday, Jan 6, 2010 - 1:45 pm:
Update as of 21 December 2009:
Kleberg County, Texas outbreak:
- The NVSL has confirmed equine piroplasmosis (Theileria equi) in 357 horses that are directly epidemiologically linked to the index premises. The T. equi positive horses either currently live or previously lived on the index premises, or live on a premises immediately adjacent to the index premises, or are dangerous contacts (positive foal born to an infected mare, or temporarily boarded on index premises).
- The epidemiologically linked T. equi positive horses are currently located in 12 States as follows: 289 T. equi positive horses are located on the index ranch in Texas, 41 are on other premises in Texas, 2 are in Alabama, 2 are in California, 5 are in Florida, 1 is in Georgia, 2 are in Indiana, 5 are in Louisiana, 1 is in Minnesota, 2 are in North Carolina, 4 are in New Jersey, 1 is in Tennessee, 1 is in Utah, and 1 is in Wisconsin.
- Over 1,500 horses have been tested for equine piroplasmosis as part of the epidemiological investigation. This includes testing of 587 equine cohorts of positive T. equi horses outside of the index premises. All 587 cohorts tested have tested negative for equine piroplasmosis.
- All known T. equi positive horses are currently under quarantine.
- Transmission and entomological investigations/studies are continuing.
- Testing of all epidemiologically linked horses is ongoing.
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Member:
canderso
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Posted on Wednesday, Jan 6, 2010 - 6:29 pm:
Dr O,
I find this information fascinating.
Because the T. equi positive horses either currently live or previously lived on the index premises, or live on a premises immediately adjacent to the index premises, or are dangerous contacts, does this tell us something about transmission of the disease?
For example, if the disease were spread by biting flies, would we not have seen many more infected horses?
Trying to learn here...
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Moderator:
DrO
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Posted on Wednesday, Jan 6, 2010 - 8:13 pm:
Hello Cheryl,
Transmission is pretty well understood with this disease and you can read about in the article.
DrO
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Member:
canderso
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Posted on Thursday, Jan 7, 2010 - 3:15 pm:
When I brought my mares into Canada, the vets supervising the quarantine mentioned that there was a school of thought that Piroplasmosis could also be transmitted by flies such as mosquitoes. That was in 2007... guess we have figured a few things out?
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Moderator:
DrO
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Posted on Friday, Jan 8, 2010 - 6:30 pm:
Cheryl, rechecking the current literature there continues to be no evidence of biting fly transmission.
DrO
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Member:
canderso
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Posted on Saturday, Jan 9, 2010 - 9:32 am:
thanks!
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