Summary A serologic survey study of 5,076 Austrian cattle farming herds was carried out in the period of December 1988 till March 1990. One animal was randomly selected from each herd and the antibody titer against Anaplasma marginale in blood serum samples was evaluated by means of the complement fixation test. The number of these tested blood samples was 3.6% of 140,081 cattle herd farms of Austria. 109 (2.1 %) of the tested animals showed positive titers (1: 10) against Anaplasma marginale, in relation to the 140,081 cattle herds 0.08%. 4,786 (94.3%) blood serum samples were sero‐negative, 188 (3.8 %) reacted anticomplementary. The highest number of antibody‐positive animals of 8 tested Austrian districts could be found in Carinthia (46 = 5.7%). In Burgenland all tested sera turned out to be negative. Concerning the distribution of sero‐positive animals in Austria it can be stated that a decrease of positive reactors from southern to northern region is evident. A connection between the occurrence of anaplasmosis in Italy, Yugoslavia, Switzerland and Hungary, is postulated as a result of the different systems of keeping cattle in the provinces and the regional increase of tick invasion. Possibly an intensive animal transportation is of importance due to the introduction of the disease mentioned before. The results obtained show that anaplasmosis does occur in different areas of Austria. For control of this disease in Austria it is proposed that all imported cattle should be tested serologically for antibodies against Anaplasma marginale. Other diseases in connection with anemia should be excluded by clinical, serological, blood‐, as well as pathological examinations.

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Zusammenfassung Leukoseinfizierte und leukosefreie Rinder wurden auf die Prozentsätze E‐Rosetten und EAC‐Rosetten bildender und Oberflächenimmunglobulin tragender peripherer Lymphozyten untersucht. Bei den leukämischen Tieren wurden starke Steigerungen der Prozentsätze EAC‐Rosetten bildender und Oberflächenimmunglobulin tragender Lymphozyten festgestellt. Diese Zelltypen sind für den Hauptteil der vermehrten Lymphozytenzahl im peripheren Blut leukämischer Tiere verantwortlich. Daneben wurde bei den leukämischen Tieren auch eine Steigerung des Prozentsatzes E‐Rosetten bildender Lymphozyten festgestellt. Die Oberflächenimmunglobulin tragenden Lymphozyten leukämischer Tiere zeigten in geringerem Prozentsatz Cap‐Bildung als jene der leukosefreien Kontrollkühe. Danksagung Wir danken Frl. Angelika Rasch für ihre wertvolle Mitarbeit. Summary Studies on peripheral leucocyte populations in cattle with and without leucosis The percentage of peripheral leucocytes bearing E‐rosettes and EAC‐rosettes and surface immunoglobulins was studied in cattle with and without leucosis. The leukaemic animals showed marked increases in the percentage of lymphocytes bearing EAC‐rosettes and surface immunoglobulin. This cell type accounted for the majority of the increased number of leucocytes in the peripheral blood of the leukaemic animals. In the leukaemic animals there was also an increase in the percentage of lymphocytes bearing E‐rosettes. The lymphocytes bearing surface immunoglobulin in the leukaemic animals showed a smaller percentage of “capping” than in leucosis‐free animals. Résumé Recherches sur des populations de lymphocytes périphérique chez des bovins atteints et indemnes de leucose An a examiné le pourcentage des lymphocytes périphériques formant des rosettes E et EAC et porteurs d'immunoglobulines de surface chez des bovins atteints et idemnes de leucose. De fortes augmentations des pourcentage des lymphocytes formant les rosettes EAC leucémiques. Ces types cellulaires sont responsables de la plus grande partie du nombre augmenté des lymphocytes dans le sang périphérique des animaux leucémiques. On a également constaté une augmentation du pourcentage des lymphocytes formant des rosettes E chez les animaux atteints de leucose. Les lymphocytes porteurs d'immunoglobulines de surface des animaux leucémiques présentèrent un pourcentage moins important de formation «Cap» que ceux des vaches de contrôle indemnes de leucose. Resumen Estudios en populaciones de linfocitos periféricos de vacunos infectados y libres de leucosis Se examinaron vacunos infectados de leucosis y libres de la misma enfermedad en cuanto a los porcentajes de linfocitos periféricos formadores de rosetas E y EAC y portadores de inmunoglobulinas superficiales. En los animales leucémicos se comprobaron aumentos considerables de los porcentajes de linfocitos formadores de rosetas EAC y portadores de inmunoglobulina superficial. Estos tipos de células son responsables de la parte principal de la cantidad aumentada de linfocitos en la sangre periférica de los anim...