Toxocara: Seroprevalence in Mexico

Area of Science:

• Zoonotic diseases
• Parasitology
• Epidemiology

Background:

• Toxocariasis surveillance is lacking in Mexico, with limited seroprevalence data.
• Existing studies focus on only four states, leaving significant gaps in understanding disease distribution.
• This neglected parasitic infection poses diagnostic challenges and can be misdiagnosed, leading to severe consequences like ocular enucleation.

Purpose of the Study:

• To assess the seroprevalence of toxocariasis in pediatric and adult populations in Mexico.
• To highlight the need for improved diagnostic strategies and public health interventions for toxocariasis.
• To emphasize the importance of epidemiological surveillance for this zoonotic parasite.

Main Methods:

• Conducted seroprevalence studies in pediatric and adult populations across four Mexican states.
• Analyzed data to determine seroprevalence rates and identify associations with age groups.
• Recommended confirmatory diagnostic tests like competitive ELISAs, Western blot, or circulating antigen detection.

Main Results:

• Overall seroprevalence in children was 13.8% (1596 subjects) and in adults was 4.7% (1827 subjects).
• A significant positive association was found between toxocariasis seroprevalence and the pediatric population (P<0.0001, OR=3.285).
• Diagnostic uncertainty and misdiagnosis, particularly with retinoblastoma, were identified as significant concerns.

Conclusions:

• Toxocariasis is a significant public health concern in Mexico, particularly affecting children.
• Enhanced diagnostic approaches are necessary to reduce misdiagnosis and prevent adverse outcomes.
• Increased funding and prioritization for epidemiological surveillance of toxocariasis are urgently needed.