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    Salmonella is a gram-negative rod-shaped bacterium. They are motile and non-spore forming. These bacteria grow best at 37ᴼC but the temperature range is 5-45ᴼC. These bacteria grow at 5.5 – 9 pH ranges and grow best at neutral pH.

    They are facultative anaerobes that can survive in the absence of oxygen. Facultative anaerobes can survive in the presence of oxygen but can’t grow in the presence of oxygen. They stop their growth if oxygen is present in their surroundings. They have catalase enzyme that catalase the oxygen radicle. They don’t have superoxide dismutase enzyme that breaks the superoxide radicle and allows bacteria to grow.

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