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Recombination in Staphylococcal Bacteriophages

Laboratoire d'Ecologie Microbienne Station Centrale de Recherches Laitières et de Technologie des Produits Animaux, I.N.R.A., 78 Jouy-en-Josas, France

The only published works dealing with recombination amongst staphylococcal bacteriophages are those of Rountree & Asheshov (1961) and Wentworth & Romig (1968). These authors have demonstrated the existence of a defective lysogen by studying the recombination between invading bacteriophages and the defective lysogen. However, until now, the lack of suitable genetic markers has hampered more detailed study of staphylococcal bacteriophage recombinants. This report deals with recombination between prophages and invading bacteriophages having recognizable genetic traits associated with (a) their ultrastructure, (b) their specificity as seen by superinfection immunity, and (c) their ability to suppress the lipase reaction of host staphylococci as seen on egg yolk medium (i.e. their ability to convert an egg yolk positive (EYP) reaction to a negative (EYN) one upon lysogenization). Table 1 summarizes the characteristics of the three phages used in the present work.

Received 6 March 1972; accepted 16 May 1972.