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A modelling approach is discussed in which a deterministic pair formation model is used in combination with a related stochastic simulation model. We study the spread of a sexually transmitted disease in a population with steady and casual partnerships. Two situations are considered: one is a population with pure serial monogamy, the other a population where individuals may have one or more casual partnerships next to their steady partnership. For the same parameter values the spread of the epidemic in a population with concurrent partnerships is faster than in a population with pure serial monogamy.
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Mirjam Kretzschmar (1995) studied this question.
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