1.Explain why SLE may be difficult to diagnose and treat. 2.Explain why a person whose blood test shows an abnormally low leukocyte count should be given an antimicrobial drug before a tooth...

1.Explain why SLE may be difficult to diagnose and treat.

2.Explain why a person whose blood test shows an abnormally low leukocyte count should be given an antimicrobial drug before a tooth extraction.

3. Explain the problem when a virus attacks T-helper cells.

4.Why are the infections and cancers that accompany AIDS significant?

5.Differentiate among HIV exposure, HIV infection, and AIDS.