Bacteriophage lambda. Coliphage lambda . Enterobacteria phage lambda . lambda Phage . Phage lambda . A temperate inducible phage and type species of the genus lambda-like viruses, in the family SIPHOVIRIDAE. Its natural host is E. coli K12. Its VIRION contains linear double-stranded DNA with single-stranded 12-base 5' sticky ends. The DNA circularizes on infection. . 0.39