[Survival of Salmonella Weltevreden and S. Senftenberg in black tiger shrimp under frozen storage].

Survival of Salmonella in black tiger shrimps during frozen storage was investigated following our previous study on Salmonella contamination in frozen shrimps imported into Japan. Salmonella (S.) Weltevreden and S.

[Antibiotic susceptibility of Neisseria meningitidis from healthy and diseased persons in Japan].

We examined the susceptibilities of 100 Neisseria meningitidis strains isolated between 1990 and 2004 to 12 antimicrobial agents, finding the MIC50 to be 0.031 microg/mL and that of MIC90 of benzylpenicillin (PCG), a type of penicillin, to be 0.063 microg/mL.

[Bacterial contamination in an egg-breaking factory and its control].

From January to November, 2003, bacterial contamination was surveyed in a small egg-breaking factory that produced non pasteurized liquid egg. Test egg samples were taken at various stages of the egg processing operation. Salmonella Enteritidis was isolated from liquid egg yolk and liquid egg white on October, but was not found in any other samples (50 liquid egg samples, 21 containers and 94 attached production facilities and gloves).

[Evaluation of selective plating media for the detection of heat- or freeze-injured Staphylococcus aureus].

The efficacy of Baird-Parker (BP) agar, mannitol-salt-egg yolk (MSEY) agar and mannitol salt (MS) agar in detecting Staphylococcus aureus FRI-100 heated at 52 degrees C for 20 min in 100 mmol/L potassium phosphate buffer was determined. Brain heart infusion agar with 1% pyruvate (BHIP agar) supported the highest recovery of injured cells and was used as the control medium. Of the three selective media, significantly higher recovery of heat-injured cells was observed on BP agar than MSEY agar, and the poorest recovery was observed on MS agar (p < 0.