“…Polio is a highly infectious disease transmitted person to person or by a common vehicle (contaminated water or food). Although overcrowding associated with urban growth, as well as ensuing sanitation issues, has been determined conducive to polio virus transmission, polio cases have been found both in urban and rural settings (Chaturvedi et al, ; Maru, Getahun, & Hoshna, ). Contemporary epidemiological studies have shown that small populations have the potential to sustain prolonged silent circulation (i.e., asymptomatic spread of polio), with an upper bound of 15 years between two successive paralytic cases (Vallejo, Keesling, Koopman, & Singer, ).…”