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An unusual Salmonella typhimurium hybrid with sensitivity to coliphage lambda and salmonella phage P22 has been recovered from matings between an Escherichia coli K-12 Hfr donor and an S. typhimurium recipient. The hybrid is an excellent host for achieving genetic recombination between lambda and P22. Two broad classes of hybrid phages were isolated. The lambda-P22 hybrid class, which has the protein coat of lambda, contains at least the c region of P22. The P22-lambda hybrid class has the protein coat of P22 and has inherited at least the c marker of lambda.

Formation of Hybrids Between Coliphage λ and Salmonella Phage P22 with a Salmonella typhimurium Hybrid Sensitive to These Phages