Q26 / 370 · NTA Abhyas (NEET) 2020 · Zoology · Human Health and Diseases

Typhoid is caused by a

  • A
    Gram positive, flagellated bacterium
  • B
    Gram positive, non flagellated bacterium
  • Correct answer
    C
    Gram negative, flagellated bacterium
  • D
    Gram negative, non-flagellated bacterium

Solution

Typhoid is mainly caused by bacterium Salmonella typhimurium or Salmonella typhi. Other species causing typhoid are Salmonella paratyphi A & Salmonella paratyphi B. They are Gram negative bacteria. They cant retain Grams stain in the presence of alcohol. They are rod shaped bacteria measuring 2 - 4 µ in length and 0.5 - 0.8 µ in width. They are motile and possess multiple flagella (Peritrichous flagella). They are facultative anaerobes.

Hence, the correct answer is option: 'C'.

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