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Toxoplasma gondii  ( T .  gondii ) can be transmitted by blood transfusion. We determined the prevalence of  T .  gondii  infection in healthy blood donors in Hermosillo city, Mexico, and the association of infection with  T .  gondii  with the sociodemographic, clinical, and behavioral characteristics of blood donors. Four hundred and eight blood donors who attended two public blood banks in Hermosillo city were examined for anti- T .  gondii  IgG and IgM antibodies by using enzyme-linked immunoassays. Of the 408 blood donors (mean age 31.77 ± 9.52; range 18–60 years old) studied, 55 (13.5%) were positive for anti- T .  gondii  IgG antibodies, and 12 (21.8%) of them were also positive for anti- T .  gondii  IgM antibodies. Multivariate analysis showed that seropositivity to  T .  gondii  was associated with age (OR = 1.74; 95% CI: 1.03–2.94;  P  = 0.03) and tobacco use (OR = 2.09; 95% CI: 1.02–4.29;  P  = 0.04). Seropositivity to  T .  gondii  was correlated with the number of pregnancies, deliveries, and cesarean sections. The seroprevalence of  T .  gondii  infection in blood donors in Sonora is the highest reported in blood donors in northern Mexico so far. This is the first report of an association of  T .  gondii  exposure and tobacco use. Further research to confirm this association is needed.

Seroprevalence and Associated Risk Factors forToxoplasma gondiiInfection in Healthy Blood Donors: A Cross-Sectional Study in Sonora, Mexico