 This study found that dogs with trapanosoma cruzi infection had lower levels of peroxinase one compared to those without the infection. Additionally, dogs with trapanosoma cruzi infection and seroreactivity to other vector-borne diseases also had lower levels of peroxinase one than those without seroreactivity. This suggests that there may be an oxidative stress response in trapanosoma cruzi seroreactive dogs with no evidence of inflammation. This article was authored by Pilar Rivetanero-Barrero, Roberto Montesto C. Jimenez, Pablo Zambrano-Rodriguez, and others.