21. Principles of Disease

During which stage of syphilis is penicillin ineffective?

a. Primary syphilis

b. Secondary syphilis

c. Tertiary syphilis

d. All of the above

Individuals infected with human immunodeficiency virus (HIV) begin to show flu-like symptoms 2-4 weeks after infection. During this period, HIV is rapidly multiplying in the body. HIV will continue to slowly multiply within infected individuals for the remainder of their lives (although this can be lessened with antiretroviral therapy). HIV is an example of what type of disease?

How can a local infection become a systemic infection?