Abstract
Summary Thirty-four Aeromonas phages were surveyed and 19 of them were reexamined by electron microscopy. Thirty-three phages had contractile tails and belonged to the Myoviridae family. Only one phage had a short tail and belonged to the Podoviridae . Twenty-two phages were classified into nine species. Most phages resembled well-known enterobacterial viruses such as T2, P1, P2 and T7, indicating possible phylogenetic relationships between phages of enterobacteria and Aeromonas . The morphology of several phages, notably of T-even-type phages with very long heads, suggests that these viruses were derived from common ancestors by elongation or shortening of the head or the tail. One T-even-type phage produced numerous aberrant particles with giant heads or multiple tails.
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