When a person manufactures antibodies in response to an antigen, it is known as:
a. Active immunity.
b. Passive immunity.
Essential vitamins, mentioned in the text as a defense mechanism of the body, are
a. White blood cells.
b. The skin.
The respiratory tract.
d. The lower colon.
e. The eye.
Which of the following diseases can be transmitted by dental scalers that have
come into contact with contaminated blood?