I just found out that there has been an outbreak of Pigeon Fever at a farm in South Eastern Washington from which I had been planning on purchasing a mare. It is now end of September. How long should I wait in order to be sure that she does not have the disease or should I just forget about her and look elsewhere? She is a rarebreed and so there aren't to many to choose from.

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I would put a deposit or in
I would put a deposit or in some other way arrange to hold her, but wouldn't pick her up until at least 4 months have passed since any of their horses have gotten sick. The disease is all over the northwest, plus Utah and Colorado and California as far as I can tell. Watch for swelling on your horses, and feel for lumps! Winter coats hide a lot.
iI HAVE HAD THIS TERRIBLE
iI HAVE HAD THIS TERRIBLE PIGEON FEVER SINCE LATE AUG O8.I HAVE LOST MY PRIZE MARE AND BEST FRIEND,FROM A INTERNAL ABCESS THAT BURST AFTER SHE SEEMED LIKE SHE WAS CURED.I WAS EVEN RIDING HER ALOT,SHE HAD IT ON BOTH SIDES OF CHEST AND ALL OVER HER STOMACH THERE WAS DRANING PUS,I DOCTORED HER FOR 2 MONTHS.AND IF I HAD IT TO DO OVER I WOULD NOT OF GAVE HER THE PENICIILIN AFTER THE FIRST ABCESS. YOU HAVE TO GIVE BUTTE FOR A FEW DAYS WHEN THEY ARE SO SWOLLEN AND IN PAIN.I USE THE APPLE TASTING POWDER IN GRAIN 2 TIMES A DAY. THEN AFTER I GOT HER ALL BETTER I WOULD OF GIVEN HER TMP W SULFPHUR FOR A MONTH OR SO.WE ARE DOING THAT NOW WITH THE ONE MARE THAT HAS HAD IT EVERYWHERE THAT POOR GIRL WE THOUGHT SHE WOULD DIE! BUT WE GAVE HER RED CELL[REBUILDS CELLS] IN HER EQUINE SENIOR SHE IS IN HER 20'S AND HAVE HER ON THE TMP W SULFPHUR A DAY.SHE IS LIKE A YOUNG HORSE AND DOING GREAT.WE PRAY THIS WORKS NO ONE HAS ANSWERS !ASK YOUR VET ! I THINK THEY ARE IN THE DARK AS WE ARE THO.I STILL HAVE 2 HORSES OUT OF 7 THAT KEEP GETTING IT BACK.I HAVE LEARNED ALOT.YOU DO NOT GIVE PENICILLIN BEFORE THE ABCESS IS LANCED OR EVEN RIGHT AFTER THAT.WHEN YOU FINE ANY SWELLING YOU HAVE TO PACK IT 2/3 TIMES A DAY WITH HOT PACKS,I USE HOT WATER BOTTLES LIKE WE USE TO USE FOR THE WINTER.HOT TOWELS IN SUMMER. TO MAKE SURE THAT IS THE RIGHT SPOT.USUALLY THE HAIR WILL COME OFF IF IT IS READY.THEN CALL YOUR VET AND HAVE THEM LANCE IT.THEN 2/3 TIMES A DAY DELUTE BENEMINE WITH WATER WARM AND FLUSH IT GOODI DO NOT HAVE ALL THE ANSWERS BUT KNOW FROM EXPERIENCE WHAT HAS AND HAS NOT WORKED FOR US.I TRULEY PRAY THEY FIND A VACCINE FOR THIS TERRILBE DISEASE.THEY HAVE ONE FOR THE COWS GOATS,SHEEP,BUT IT IS A DIFFERENT STRAIN THEY GET OF IT.