A proposal for further modification of the phage-typing system for coagulase-negative staphylococci.

Our phage-set, published in 1975 (6) was modified in that other staphylococcal hoststrains were found more suitable for the propagation. This new typing set of 15 phages should replace our old phage-sets. In comparing the phage-sets of Dr. Verhoef, Dr. Parisi and Dr. Blouse with our phages, the advantages of our new phage-set could be demonstrated. Lysogeny induction experiment with mitomycin C and UV-rays showed all staphylococcal host strains to be lysogenic. Conclusions of the studies performed were derived from and discussed.