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Age-specific prevalence of Trypanosoma cruzi infection in dogs, as determined through the composite results of serodiagnosis and xenodiagnosis (A), and relationship with the density of domestic T. infestans infected with T. cruzi (B). Trinidad and Mercedes, September and December 1988, respectively. The line in (A) is the fit of the catalytic model with constant force of infection over time and age. Numbers close to data points represent the numbers of dogs examined for infection.
