Why make case definitions? There are 2 purposes:
a) to determine treatment;
b) for recording and reporting (see Chapter 2).
Why do case definitions determine treatment? There are 3 reasons:
a) to identify priority cases;
b) to make the most cost-effective use of resources (by targeting resources on priority cases);
c) to minimize side-effects for patients (by using the most intensive regimens only for certain cases).
What determines a case definition? There are 4 determinants: a) site of TB;
b) result of sputum smear;
c) previous TB treatment;
d) severity of TB.
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