Question

You are infected with a pathogen; it is your first exposure to this pathogen.  The first antibody...

You are infected with a pathogen; it is your first exposure to this pathogen.  The first antibody types that will eventually appear in your blood to help fight this infection will be:

A.

IgA
B.

IgD
C.

IgE
D.

IgG
E.

IgM
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Answer #1

Answer: E. IgM

Explanation: Various immunoglobulins act when we are exposed to a pathogen. They are the proteins which are the part of the immune system and fight against the pathogen. IgM act as the primary response to the pathogen as this antibody does not require the process called class switch. Class switch is to change to another antibody class as per the requirement. Also, another fact is it does not have memory cells so it act until the pathogen remains in the body.

Incorrect answers:

IgA: Occurs on the mucosal surfaces such as respiratory after IgM. It also helps in the protection against pathogen.

IgD: It is a part of the B cell receptor. Its function is to activate mast cells and basophils.

IgE: Involved mainly in allergic reaction.

IgG: Act as the secondary response of the immune system in the body. Appears after IgM in the serum.

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