Urassa, M.

population intervention group traveller study condom immigrant contact health education behaviour impact hiv prevalence mobility prevalence one-o ff contacts people e ffectiveness condom promotion non-participation health migration study population partner travel education risk behaviour infection model condom use promotion women hiv interventions assumption stdsim control visitor person modelling hiv cases ffectivenes period 1 week visit number non-migrant prevention table result transmission one-o disease sex contacts 1.1 hiv infection epidemic africa campaign csw visits tanzania migrant journal spread hiv transmission fferent parameter baseline situation relationship reduction simulation 3 weeks mwanza scenario truck ceremony kenya adult suppl 15–55 kisesa ficiency syndromes 2004