Question

There is only one specific antibody for each antigen. True False

On first exposure, how many days until Peak antibody levels?

	a.	1 -3 days
	b.	5 -7 days
	c.	Less than 24 hours
	d.	10 - 14 days

Answer 1

The antibody is said to "match" the antigen in the sense that it can bind to it due to an adaptation in a region of the antibody; because of this, many different antibodies are produced, each able to bind a different antigen while sharing the same basic structure. In most cases, an adapted antibody can only react to and bind one specific antigen; in some instances, however, antibodies may cross-react and bind more than one antigen.

Also, an antigen is a molecule that binds to Ag-specific receptors, but cannot necessarily induce an immune response in the body by itself.so it is false that there is only one specific antibody for each antigen.

immunofluorescent antibody assays in 30 patients with (SARS) severe acute respiratory distress syndrome. Seroconversion for IgG (mean 10 days) occurred simultaneously, or 1 day earlier, than that for IgM and IgA (mean 11 days for both). IgG could be detected as early as 4 days after the onset of illness.Tests for IgG, IgM or IgA were negative until at least 3 days after the onset of illness in all 30 patients . The earliest time at which these three antibodies reached peak levels was similar (mean 15 days). So option D-day 10-14 days is correct.