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. 2010 Nov 4;6(11):e1000968. doi: 10.1371/journal.pcbi.1000968

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Hill 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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There are three processes by which an individual's state can change. (i) An infected individual transmits infection to a susceptible contact with rate . (ii) A susceptible individual spontaneously becomes infected at rate , regardless of the state of their contacts. (iii) An infected individual returns to being susceptible at rate , independent of the state of their contacts.

Inline graphic — There are three processes by which an individual's state can change. (i) An infected individual transmits infection to a susceptible contact with rate . (ii) A susceptible individual spontaneously becomes infected at rate , regardless of the state of their contacts. (iii) An infected individual returns to being susceptible at rate , independent of the state of their contacts.