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. 2011 Dec 22;6(12):e29130. doi: 10.1371/journal.pone.0029130

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Dodd et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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An active TB case develops at , and remains active until . The probability that this case avoids death, self-cure or detection by routine services to remain active at is . In the presence of -periodic active case-finding (vertical lines) beginning at time , the case must also avoid detection by intersection with case-finding rounds (marked as filled circles), which occurs with probability .

Inline graphic — An active TB case develops at , and remains active until . The probability that this case avoids death, self-cure or detection by routine services to remain active at is . In the presence of -periodic active case-finding (vertical lines) beginning at time , the case must also avoid detection by intersection with case-finding rounds (marked as filled circles), which occurs with probability .