There is provided a bacteriophage capable of lysing a P. acnes bacterium and incapable of lysing a bacterium which is not P. acnes , and which is incapable of sustaining lysogeny in a bacterium.

The above-described lactic acid bacterium includes Lactococcus garvieae.

In particular, a bacterium such as, e.g., one which enhances intestinal absorption, is produced.

As the above-described bacterium belonging to the genus Aureobacidium sp., Aureobasidium pullulans M-1 (FERM BP-08615) is preferable.

Further, a method for producing natto with increased vitamin B2 content by producing the natto using the Bacillus natto and the natto produced by the production method are provided.

As the lactic acid bacterium, a bacterium belonging to the genus Lactobacillus, Tetragenococcus, Pediococcus or Streptococcus can be used.

The bacterium is useful as a vaccine.

bacterium of the rhizosphere of graminaceae

Every single bacterium can communicate with every other bacterium.

The invention relates to an S thermophilus bacterium which is restant to attack by at least one bacteriophage, a method of production of the bacterium and a composition which comprises the bacterium.

Then bases respectively specific to Vibrio cholerae and Vibrio mimicus are identified.

It is intended to provide a method of mutating a bacterium and thus regulating the invasion of the bacterium into host cells to thereby lower the infectivity of the bacterium; and utilization of the bacterium as a vaccine-producing strain.

Alternatively, above-described strong oxidative digestion bacterium may be a PVA-digesting bacterium belonging to the genus Pseudomonas or Acinetobacter.

The invention relates to a mutant pathogenic bacterium, preferably a mutant intracellular pathogenic bacterium, that is incapable of expressing one or more metabolic genes; preferably the mutant pathogenic bacterium is attenuated.

An encapsulated bacterium, the bacterium containing an insecticidal toxin, wherein the bacterium is encapsulated by polymeric material.