Abstract
The incidence of myocardial sarcocystis infection and of myocardial pathological changes was recorded in samples of 79 healthy cattle obtained from an abattoir. The incidence rate of thin-walled cysts of S. cruzi was 81.0 %, while mixed infection with thick-walled cysts of S. hominis and/or S. hirsuta was found in 5.0 %. Focal interstitial myocarditis was found in 31.6 % of the samples. The sarcocystis infection and the interstitial mononuclear cell infiltrates were positively associated (P < 0.05). Intimai proliferations of musculo-elastic or fibro-elastic tissues in the intramural coronary arteries were found in 75.0 % of the cattle older than 3% years of age, and in 45.7 % of the cattle less than 3½ years old. No association of the arterial lesions and the sarcocystis infection was demonstrated.
Keywords: sarcocystis, myocarditis, arteriosclerosis, cattle
Sammendrag
Insidensen av sarcocystis-infeksjon og patologiske forandringer i myocard ble undersøkt i et slaktehusmateriale fra i alt 79 friske storfe. Frekvensen av cyster med tynn vegg som er karakteristisk for S. cruzi, ble påvist hos 81,0 %. Blandingsinfeksjon av S. hominis og S. hirsuta som begge har tykk cystevegg, ble funnet hos 5,0 %. Fokal interstitiell myocarditt ble påvist i 31,6 % av prøvene. Sarcocystis-infeksjonen og forekomsten av interstitiell myocarditt var positivt assosiert.
I koronar-arteriene ble det påvist intimafortykkelser som følge av proliferasjon av glatt muskulatur, bindevev og elastiske fibriller. Hos storfe eldre enn 3% år ble det funnet karforandringer hos 75,0 %, og hos storfe yngre enn 3½ år hos 45,7 %. Det syntes ikke å vaere sammenheng mellom sarcocystis-infeksjonen og forekomsten av karforandringer.
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