36_Immune_Diseases

36_Immune_Diseases - X X X X X X X X X V V V I I I . . . I...

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Unformatted text preview: X X X X X X X X X V V V I I I . . . I I I m m m m m m u u u n n n i i i t t t y y y a a a n n n d d d I I I m m m m m m u u u n n n e e e D D D i i i s s s e e e a a a s s s e e s s s Primary and Secondary Immune Responses P P r r i i m m a a r r y a y a n n d S d S e e c c o o n n d d a a r r y I y I m m m m u u n n e R e R e e s s p p o o n n s s e e s s The speed with which our bodies respond to infection is a function of its prior history. If the antigen has never been encountered before, we talk about primary response; if the body has already fought off this antigen before, the response is called secondary. P P P r r r i i i ma a a r r r y y y r r r e e e s s s p p p o o o n n n s s s e e e m m The primary response peaks at about 15 days after exposure to the antigen. Both cellular and humoral responses occur, during which B- memory and T-memory cells are produced. Se e e c c c o o o n n n d d a a a r r r y y y r r r e e e s s s p p p o o o n n n s s s e e e S S d Secondary response peaks faster, at about 8 days after infection, however level of antibodies similar to peak of primary response is found already after 2 days. Because B-memory cells are present, the clonal selection and proliferation are more rapid. Many times more antibodies are produced in the secondary response than in the primary....
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36_Immune_Diseases - X X X X X X X X X V V V I I I . . . I...

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