SAXEGAARD, FINN : Serological investigations of Mycobacterium fivium and M. avium-like bacteria isolated from domestic and wild animals. Acta vet. scand. 1981, 22, 153-161. -One hundred and two Mycobacterium avium and M. avium-like strains isolated from domestic and wild animals we re submitted to serological typing by means of the agglutination method developed by Schaefer. Of the 82 porcine strains M. Intracellulare serotype 8 dominated, followed in order of frequency by serotypes 1, 4, 2, 10

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... and 6. Of the 20 strains originating from other animals 7 were typed as either serotype 2, 3, 8 or 10. The 3 strains isolated from wild birds were all serotype 2. As a considerable number of the wild animal strains were autoagglutinable, the suitability of the agglutination test for typing such strains is discussed. M Ycob act e r i u m a v i urn; M. i n t r ace II u I are; s e r 0t Ypin g; a g g I uti nat ion. Along with the eradication and decreasing occurrence of Mycobacterium tuberculosis and M. bovis in various countries increasing interest has arisen in the so-called atypical, anonymous or nontuberculous mycobacteria. Several reviews relating to these bacteria have been published, most recently by Wolinsky (1979) who maintains that nontuberculous mycobacteria is -the most appropriate term. Among these bacteria the M. avlum-intracellulare complex with its 28 serotypes (Wolinsky) constitutes a large and comprehensive group, the epidemiology of which has been extensively elucidated since Schaefer (1965) introduced his serological typing procedure. Later the occurrence of these bacteria in animals has been reported from • This investigation was supp ort ed by grants Crom the Norwegian Agricultural Research Council.