Abstract
Host cell reactivation (HCR) does not occur with phages T1, T3, and P22 after inactivation by nitrous acid, in contrast to inactivation by ultraviolet light. Multiplicity reactivation, which is due to genetic exchange, occurs after inactivation by both agents. It is concluded that HCR is caused not by a genetic exchange between phage and bacterial genomes, but by an enzymatic reactivation comparable to photoreactivation or u-gene reactivation in T4 and T2 u.
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