Besnoitia bennetti infection was detected in two Mexican burros from a closed herd of 15 animals in Maryland. Cystic stages, which were about 1.0 mm in diameter, were found in the testicle of a male and in the skin of the perineum and teat of a female. The superficial location of the cysts on the teat suggests the potential for traumatic rupture and oral transmission during nursing by a foal. The wall of the cysts was 10–15 μm thick and consisted of four layers, the outer of which was birefringent. Within each cyst was a mass of organisms each about 1–2 by 5 μm. Various histochemical stains were used. This is the first confirmed diagnosis and report of natural infection with B. bennetti originating within the United States.
References
1.
BassonP.A.van NiekerkJ.W.McCullyR.M.BigalkeR.D.:
Besnoitiosis in South African antelopes: a preliminary note on the occurrence of Besnoitia cysts in the cardiovascular system.
J. sth afr. vet. med. Ass.36:
578
(1965).
2.
BigalkeR. D.:
Studies on equine besnoitiosis.
2nd int. Congr. Parasit. J. Parasit.56:
29
(1970).
3.
BigalkeR.D.van NiekerkJ.W.BassonP.A.McCullyR.M.:
Studies on the relationship between Besnoitia of blue wildebeest and impala, and Besnoitia besnoiti of cattle.
Onderstepoort J. vet. Res.34:
7–28
(1967).
4.
BigalkeR. D.:
The present concept of the life cycle of Besnoitia besnoiti of cattle.
2nd int. Congr. Parasit. J. Parasit.56:
29–30
(1970).
5.
FrenkelJ.K.:
Infections with organisms resembling Toxoplasma.
Riass. Commun. 6th Congr. Int. Micro. Biol. Rome.vol. 2,
pp. 556–557 (1953).
6.
GorlinR. J.BarronC.N.ChandhryA.P.ClarkJ.J.:
The oral and pharyngeal pathology of domestic animals: a study of 487 cases.
Amer. J. vet. Res.20:
1032–1061
(1959).
7.
HadwenS.:
Cyst-forming protozoa in reindeer and caribou, and a sarcosporidian parasite of the seal (Phoca richard).
J. amer. vet. med. Ass.61:
374–382
(1922).
8.
JellisonW.L.:
On the nomenclature of Besnoitia besnoiti, a protozoan parasite.
Ann. N.Y. Acad. Sci.64:
268–270
(1956).
9.
JellisonW.L.FullertonW.J.ParkerH.:
Transmission of the protozoan Besnoitia jellisoni by ingestion.
Ann. N.Y. Acad. Sci.64:
271–274
(1956).
10.
LevineN.D.:
Protozoan parasites of domestic animals and of man.
pp. 337–341 (
Burgess Publishing,
Minneapolis1961).
11.
McCullyR.M.BassonP.A.van NiekerkJ.W.BigalkeR.D.:
Observations on Besnoitia cysts in the cardiovascular system of some wild antelopes and domestic cattle.
Onderstepoort J. vet. Res.33:
245–276
(1966).
12.
PolsJ.W.:
Studies on bovine besnoitiosis with special reference to the aetiology.
Onderstepoort J. vet. Res.28:
265–356
(1960).
13.
SchneiderC.R.:
Besnoitia panamensis sp. r. (Protozoa: Toxoplasmatidae) from panamanian lizards.
J. Parasit.51:
340–344
(1965).
14.
SchulzK.C.A.ThorburnJ. A.:
Globidiosis = a cause of dermatitis in the horse.
J. sth afr. vet. med. Ass.26:
39–43
(1955).
15.
SchulzK.C.A.:
A report on naturally acquired besnoitiosis in bovines with special reference to its pathology.
J. sth afr. vet. med. Ass.31:
21–35
(1960).
