Comparison of the performance of SAG2, GRA6, and GRA7 for serological diagnosis ofinfection in cats.

Abstract

Toxoplasmosis is an important zoonotic disease caused bythat can infect almost all warm-blooded animals worldwide, including humans. The high prevalence ofinfection and its ability to cause serious harm to humans and animals, especially immunodeficient individuals, make it a key public health issue. Accurate diagnostic tools with high sensitivity are needed for controllinginfection. In the current study, we compared the performance of recombinant SAG2, GRA6, and GRA7 in ELISA for the serological diagnosis ofinfection in cats. We further investigated the antigenicity of recombinant dense granule protein 3 (rGRA3), rGRA5, rGRA8, and rSRS29A expressed in a plant-based, cell-free expression system for detecting antibodies in-infected cats. In summary, our data suggest that GRA7 is more sensitive than the other two antigens for the serodiagnosis ofinfection in cats, and GRA3 expressed in the cell-free system is also a priming antigen in serological tests for detectinginfection in cats.