# Molecular identification of Coranus spp. in a pregnant patient: A case of misidentified Chagas disease vector in Spain

## TL;DR

A pregnant woman in Spain mistakenly believed an insect bite exposed her to Chagas disease, but molecular testing revealed the insect was not a disease vector.

## Contribution

This case highlights the importance of molecular identification in resolving misdiagnosed Chagas disease vector encounters in non-endemic regions.

## Key findings

- Serological testing for T. cruzi antibodies was negative in the patient.
- Molecular analysis confirmed the insect was Coranus spp., not a Chagas disease vector.
- The case emphasizes the need for accurate arthropod identification to prevent unnecessary public health concerns.

## Abstract

Chagas disease is a significant public health concern in the Americas, transmitted primarily by vectors of the Triatominae subfamily. While Europe, particularly Spain, is free from endemic vectors, the potential for misidentification of non-hematophagous insects as Chagas vectors exists, leading to unnecessary alarm. We present the case of a 31-year-old pregnant Venezuelan woman residing in Spain, who sought medical attention after being bitten by an arthropod she identified as Triatoma infestans. The patient's awareness of Chagas disease in her country of origin heightened her concern about vertical transmission of Trypanosoma cruzi to her fetus. However, serological testing for T. cruzi antibodies was negative. The insect was initially misidentified as T. infestans but was later confirmed through molecular analysis to be Coranus spp., a non-hematophagous reduviid predator. The 18S rRNA gene sequence revealed a 99.37 % similarity to Coranus spp., ruling out any vectorial capacity for Chagas disease. This case underscores the importance of accurate arthropod identification, especially in non-endemic regions, to prevent misdiagnosis and unnecessary treatment. From a public health perspective, the introduction of a Chagas disease vector into Spain would represent a serious threat, necessitating prompt identification and containment measures. Our findings highlight the challenges posed by invasive species and the need for vigilance in regions where Chagas disease is not endemic. Proper identification of suspected vectors is crucial to ensure appropriate clinical and public health responses, preventing unwarranted anxiety and ensuring accurate disease surveillance.