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- One should observe that the network studied in Ref. [8] is a cumulative network of actual sexual contacts—it represents the sum of all contacts over a specified period of time. Although this is similar to other networks of sexual contacts studied previously [50][51] it is not the network required by our models, which is the instantaneous network of connections (not contacts—see Sec. II). While the network measured may be a reasonable proxy for the network we need, it is not known if this is the case.
- It is also worth noting that networks of sexual contacts observed in sociometric studies [51] are often highly dendritic, with few short loops, indicating that the treelike components of our percolating clusters may be, at least in this respect, quite a good approximation to the shape of real STD outbreaks.
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