Which of the following contributes to the virulence of a pathogen?
A
Toxins
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B
Capsule
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C
Adhesins
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D
All of the above
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Solution
The correct option is D All of the above Virulence is the ability of an infectious agent to cause a disease. Toxins are small molecules, peptides, or proteins produced by pathogens that can cause a disease on contact with body tissues. For example, Clostridium botulinum produces botulism toxin.
Capsules form the outer structure of many bacterial cells and are made of carbohydrates. They inhibit phagocytosis and protect the bacteria from engulfment. For example, Neisseria meningitides.
Adhesins are surface components or appendages (fimbria or pilus) of pathogens that help in its adhesion to host cells. For example, Neisseria gonorrhoea has fimbria for adhesion