[Toxoplasmosis in the Congo Republic. Seroepidemiological study]

Area of Science:

• Medical Parasitology
• Infectious Diseases Epidemiology

Background:

• Toxoplasma gondii is a widespread protozoan parasite with significant public health implications.
• Understanding the seroprevalence and transmission dynamics of toxoplasmosis in diverse populations is crucial for effective control strategies.

Purpose of the Study:

• To determine the seroprevalence of Toxoplasma gondii infection in a large, diverse population in Congo.
• To investigate potential risk factors, including age, gender, occupation, and environmental factors, associated with Toxoplasma gondii infection.

Main Methods:

• Serological testing for immunoglobulin G (IgG) and immunoglobulin M (IgM) antibodies against Toxoplasma gondii.
• Analysis of a cohort of over 2,500 individuals aged 0-65 years from various regions of Congo.
• Statistical analysis to assess correlations between seropositivity and demographic, occupational, and environmental factors.

Main Results:

• Overall IgG seroprevalence was approximately 33% in children over 9 years and 40% in adults.
• IgM positivity indicated early exposure in 11% of children aged 4-9 years and 5-7% of young women aged 15-30 years.
• No significant differences in seroprevalence were detected based on geographic origin despite regional variations; an ethnic factor may be involved. Farmers showed lower positivity rates, while diet and animal contact did not appear to influence infection rates.

Conclusions:

• Toxoplasma gondii infection is highly prevalent across all age groups in the studied Congolese population.
• Early childhood and young adulthood represent key periods for primary infection, as suggested by IgM findings.
• While occupational factors like farming may offer some protection, further research is needed to elucidate the role of ethnicity and other potential transmission routes in this region.