Multiple choice

Which of the following micro-organisms does not use antigenic variation as a major means of evading host defences?

  1. Streptococcus pneumoniae

  2. Influenza A virus

  3. Borrelia recurrentis

  4. HIV

  5. Trypanosomes
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A Correct answer
Explanation

There are at least 93 serotypes in the world, though 23 prevalent serotypes that cause disease in different parts of the world, but no switching of the bacterium between serotypes. Infections with these organisms are common and often infect those with antibody or innate or combined deficiencies.

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