Title

Toxoplasma gondii seropositivity and substance use in US adults

Keywords

Toxoplasmosis, tobacco, alcohol, marijuana, cocaine, heroin, methamphetamine, drug use

Abstract

The intracellular parasite Toxoplasma gondii (Nicolle et Manceaux, 1908) infects humans resulting in acute toxoplasmosis, an infection that in immunocompetent people is typically mild but results in persistent latent toxoplasmosis. In that T. gondii appearsto affect dopamine synthesis and because addicting drugs affect midbrain dopamine transmission, latent toxoplasmosis could influencesubstance use. Using both the third and continuous National Health and Nutrition Examination Surveys from the US Centers for Dis- ease Control and Prevention, we used logistic regression to test for associations between T. gondii seropositivity and subject self-report of having ever used tobacco, alcohol, marijuana, cocaine, heroin, or methamphetamine. In the third NHANES dataset, which included data for tobacco, alcohol, marijuana and cocaine, T. gondii seropositivity was associated with a reduced likelihood of self-reported marijuana (OR = 0.71 [95% CI: 0.58; 0.87]; p = 0.001) and cocaine use (OR = 0.72 [95% CI: 0.56; 0.91]; p = 0.006). In the continuous National Health and Nutrition Examination Surveys dataset, which included data for all six substances, T. gondii seropositivity was associated with a reduced likelihood of self-reported tobacco (OR = 0.87 [95% CI: 0.76; 1.00]; p = 0.044), marijuana (OR = 0.60 [95% CI: 0.50; 0.72]; p < 0.001), heroin (OR = 0.60 [95% CI: 0.42; 0.85]; p = 0.005) and methamphetamine use (OR = 0.54 [95% CI: 0.38; 0.77]; p = 0.001). We observed interactions between sex and T. gondii seropositivity in the prediction of self-reported use of tobacco and alcohol. Further, T. gondii seropositivity appeared to remove the protective effect of education and economic status against self-re-ported cigarette smoking. These findings suggest that T. gondii seropositivity may be inversely associated with some but not all types of substance use in US adults.

Original Publication Citation

Berrett, Andrew N., Shawn D. Gale, Lance D. Erickson, Evan L. Thacker, Bruce L. Brown & Dawson W. Hedges. (2018). Toxoplasma gondii seropositivity and substance use in US adults. Folia Parasitologica.

Document Type

Peer-Reviewed Article

Publication Date

2018-09-10

Publisher

Folia Parasitologica

Language

English

College

Family, Home, and Social Sciences

Department

Sociology

University Standing at Time of Publication

Associate Professor

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