PLoS ONE (Jan 2022)

Toxoplasma gondii infection and insomnia: A case control seroprevalence study.

  • Cosme Alvarado-Esquivel,
  • Sergio Estrada-Martínez,
  • Alma Rosa Pérez-Álamos,
  • Agar Ramos-Nevárez,
  • Karina Botello-Calderón,
  • Ángel Osvaldo Alvarado-Félix,
  • Raquel Vaquera-Enríquez,
  • Gustavo Alexis Alvarado-Félix,
  • Antonio Sifuentes-Álvarez,
  • Carlos Alberto Guido-Arreola,
  • Elizabeth Rábago-Sánchez,
  • Leandro Saenz-Soto

DOI
https://doi.org/10.1371/journal.pone.0266214
Journal volume & issue
Vol. 17, no. 6
p. e0266214

Abstract

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We determined the association between Toxoplasma gondii (T. gondii) infection and insomnia. Through an age-and gender-matched case-control study, 577 people with insomnia (cases) and 577 people without insomnia (controls) were tested for anti-T. gondii IgG and IgM antibodies using commercially available enzyme-immunoassays. Anti-T. gondii IgG antibodies were found in 71 (12.3%) of 577 individuals with insomnia and in 46 (8.0%) of 577 controls (OR = 1.62; 95% CI: 1.09-2.39; P = 0.01). Men with insomnia had a higher (16/73: 21.9%) seroprevalence of T. gondii infection than men without insomnia (5/73: 6.8%) (OR: 3.81; 95% CI: 1.31-11.06; P = 0.009). The rate of high (>150 IU/ml) anti-T. gondii IgG antibody levels in cases was higher than the one in controls (OR = 2.21; 95% CI: 1.13-4.31; P = 0.01). Men with insomnia had a higher (8/73: 11.0%) rate of high anti-T. gondii IgG antibody levels than men without insomnia (0/73: 0.0%) (P = 0.006). The rate of high anti-T. gondii IgG antibody levels in cases >50 years old (11/180: 6.1%) was higher than that (3/180: 1.7%) in controls of the same age group (OR: 3.84; 95% CI: 1.05-14.00; P = 0.05). No difference in the rate of IgM seropositivity between cases and controls was found (OR = 1.33; 95% CI: 0.57-3.11; P = 0.50). Results of this seroepidemiology study suggest that infection with T. gondii is associated with insomnia. Men older than 50 years with T. gondii exposure might be prone to insomnia. Further research to confirm the association between seropositivity and serointensity to T. gondii and insomnia is needed.