. infection below which mass peatment will become unfavourable in terrns of cost-effectiveness. However, it also implies that above this value variations in the prevalence of infection have little effect on the cost per infected person treated. The precise prevalence value at which this non-linearity is evident is dependent on the cost per person treated: the higher this cost, the lower the pre...

INTRODUCTION: This study reports, for the first time, the presence of Panstrongylus lignarius in the State of Rondonia, Brazil. METHODS: Specimen of P. lignarius was collected from a flat in an urban area of the municipality of Porto Velho, Western Amazon. RESULTS: With this finding of P. lignarius, the number of Triatominae species in the State of Rondonia has increased from six to seve...