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Properties of a new phage lytic for Brucella Suis

Ministry of Agriculture, Fisheries and Food Central Veterinary Laboratory, Weybridge, Surrey, U.K.

The properties of a new brucella phage isolated from culture fluids of Brucella suis and designated the Weybridge phage, were examined. The phage was lytic for smooth Br. abortus, Br. suis and Br. neotomae cultures but there was no lysis of Br. melitensis, Br. canis or Br. ovis strains. The host range, adsorption pattern, chemical stability and particle morphology were similar to those reported for brucella phages M51 and S708. However, phage neutralization tests established that Weybridge phage was serologically distinct from M51 and S708 although the three phages possessed antigenic determinants in common with each other and with the Tbilisi reference phage. One-step growth experiments of Weybridge phage on Br. abortus, Br. suis and Br. neotomae are described. No evidence of lysogeny was found although the origins of the phage were suggestive of this.

Received 13 June 1973; accepted 21 August 1973.