By J. F. Acar, D. H. Bouanchaud, Y. A. Chabbert (auth.), Prof. Jürgen Drews, Univ.-Doz. Dr. Gregor Högenauer (eds.)

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Additional resources for R-Factors: Their Properties and Possible Control: Symposium, Baden near Vienna, April 27–29, 1977

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Level of resistance against particular drugs. Transferability of resistance into standard hosts. The fertility inhibition (fi) character. Compatibility grouping (2, 3, 4, 5). Phage restriction in standard salmonella strains. Class of transfer systems involved: Class 1, in which the transfer factor and resistance determinant form a single covalently-bonded linkage group which is transferred intact to recipient cells and remains transferable from the new host; and Class 2, in which the transfer factor is distinct from, but mediates the transfer of, the resistance determinants, which are independent non-autotransferring plasmids (1, 6, 7, 8, 9).

Typhi isolated from a patient infected in Spain (16). The R-type was CSSu (Class 1). typhimurium cultures carried H2 plasmids of R-type CKSSu (Class 1). were isolated from man (8), bovin~s These cultures (4) and birds (2) in 1973 and 1976. All but one belonged to phage type 1, which suggests that they are clonal in nature. Group H2 plasmids are evidently endemic to the Iberian peninsula. typhimurium from South America. These cultures were largely isolated from severe epidemics in paediatric units, with a high morbidity rate, and a mortality rate of the order of 20 - 30'/0.

Typhoid bacillus. Brit. Med. J. Chloramphenicol resistance in the ~, 329-331 (1972). 17. Anderson, E. , Threlfall, E. , Carr, J. M. and Frost, J. : Transferable drug resistance in salmonellae in South America. Proc. Soc. Gen. Microbiol. 1, 66 (1974). a~d Central 38 18. Anderson, E. , Threlfall, E. , Carr, J. , McConnell, M. M. and Smith, H. : Studies of FI plasmids with special reference to those predominating in Salmonella typhimurium in the Middle East. Submitted for publication. 19. , Rahal, A.

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