1.   Human subjects nevertheless have produced more protective antibodies after vaccination than the chimps.

2.   This treatment involves a series of allergy shots that reduce IgE antibodies in the blood, and instead produces a protective antibody known as IgG.

3.   The polio vaccine works by spurring the immune system to make protective antibodies.

4.   They will see if the diluted vaccines trigger production of protective antibodies and create a telltale scab.