“…Insofar as we are aware, almost no research has been done on this issue at the level of the community, city or metropolitan area. Clearly, this is another important area for research-that is, to determine the causes of, Impacts of ''Big events'' on Networks and thence on HIV As we and others have previously argued (Aral, 2002;Friedman et al, in press;Friedman & Reid, 2002;Hankins, Friedman, Zafar, & Strathdee, 2002), ''big events'' like wars, sociopolitical transitions, economic collapses, or ecological disasters can disrupt both social networks and risk networks, as well as the normative influence and the practical assistance that they can provide. These disruptions, in turn, can lead to outbreaks of HIV and other diseases.…”