A patient received a tuberculosis skin test injection of purified protein derivative (PPD) 72 hours ago. Which assessment finding of the test site should be interpreted as a positive reaction?
a. The injected area has a blister-like swelling about 2 mm high and 2 mm in diameter.
b. The injection site is puffy and soft with pus oozing from the needle hole.
c. The skin is red and very hard for 12 mm around the injection site.
d. There is a large bruise surrounding the injection site.
ANS: C
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