“…Although numerous research reports, including our pilot study, found an association between T. gondii and schizophrenia (Mortensen et al, 2007;Torrey et al, 2007;Niebuhr et al, 2008a;Pedersen et al, 2011;Wang et al, 2013), a few others lack positive findings (Buka et al, 2001;Conejero-Goldberg et al, 2003;Leweke et al, 2004;Xiao et al, 2009;Yolken et al, 2011). Similar inconsistency is observed with other agents under consideration (Albrecht et al, 1980;Shrikhande et al, 1985;Gordon et al, 1996;Fukuda et al, 1999;Niebuhr et al, 2008b;Dickerson et al, 2010aDickerson et al, , 2010bNiebuhr et al, 2011;Jin et al, 2012).…”