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The epidemiological type identification of Serratia marcescens from outbreaks of infection in hospitals

Published online by Cambridge University Press:  15 May 2009

T. L. Pitt ,
Y. J. Erdman  and
C. Bucher
T. L. Pitt
Affiliation:
Central Public Health Laboratory, Division of Hospital Infection, Colindale Avenue, London NW9 5HT
Y. J. Erdman
Affiliation:
Department of Bacteriology, St Mary's Hospital Medical School
C. Bucher
Affiliation:
Institut Central, Hospitaux valaisans, 1950 Sion, Switzerland
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Summary

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A study of serological, bacteriocine and phage typing of Serratia marcescens was made. Specific O-antisera of adequate titre were relatively simple to prepare but H-antisera exhibited many heterologous agglutination reactions amongst the type strains. Most of these cross-reactions were not reproduced when immobilization tests with H-sera were performed. Direct haemagglutination tests were used to establish the presence of fimbriae amongst the H-type strains and the results of agglutination tests with non-fimbriate variants of strains indicated that fimbrial antibody in high titre was present in some sera.

Replicate typing of 100 pairs of cultures by the phage-typing method indicated that small variations in pattern were common and that larger variations occurred occasionally. Therefore differences in pattern of less than two strong reactions should not be taken as evidence that strains can be distinguished.

Cultures of S. marcescens, 273 in total, from six outbreaks of infection in British and European hospitals were typed by O-serology, H agglutination and immobilization tests, phage typing and bacteriocine susceptibility by a cross-streaking method. The typability of strains by each method was high but the results suggested that no single method was sufficiently discriminating to be used alone for typing. Comparison of the H-type and typing patterns of members of the same O serogroup from incidents of infection showed that reliable results were obtained by H-typing or by phage and bacteriocine typing after the application of the appropriate ‘difference’ rule.

The greatest discrimination between strains of the same 0-group was obtained by the use of H-typing or phage typing.

Type
Research Article
Information
Journal of Hygiene , Volume 84 , Issue 2 , April 1980 , pp. 269 - 283
Copyright
Copyright © Cambridge University Press 1980

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