Shigella sonnei

Basic description of microbe:

• Straight rods

• Non-motile

• Facultatively anaerobic

• Optimal temperature: 37°C

 What it looks like on the agar:

• Whole Colony                                      Irregular

• Margin                                                 Lobate

• Elevation                                              Flat     

• Color                                                   Light yellow

Biochemical Tests:

• Catalase                                               positive

• Methyl Red                                          positive

• Oxidase                                                negative

• Voges-Proskauer                                 negative

• Simmons Citrate                                   negative

• Lysine Decarboxylase                           negative

• H₂S production                                     negative

• Reduction of Nitrate                             positive

Interesting Facts:

Intestinal pathogens of humans and other primates (bacillary dysentery)