Diagnosis of antigenic markers of acute toxoplasmosis by IgG avidity immunoblotting Siamak Ali-Heydari, Hossien Keshavarz, Saeedeh Shojaee and Mehdi Mohebali Parasite, 20 (2013) 18 Published online: 22 May 2013 DOI: 10.1051/parasite/2013017