ABSTRACT
So far we have assumed that each infective has the same potential to infect others. This is not the case when the community consists of households. The primary infective of a household has more potential to infect others than a secondary infective of that household, because more susceptible household members are exposed to the primary infectives. Specifically, the primary infective in a household of size two has a chance to infect any susceptible community member outside his household and his household partner. If he infects his household partner then this partner has a similar chance to infect any susceptible community member of another household but he can not infect his household partner, who was infected earlier.
