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Immunocytochemistry Improving the Diagnosis of Trichomonas vaginalis Infections
Thaisa Helena S Fonseca1, Fabrício M Silva Oliveira2, Marina Alacoque1
1Department of Parasitology, Institute of Biological Sciences, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Insights
Immunocytochemistry (ICC) offers a more sensitive method for diagnosing trichomoniasis, especially in asymptomatic cases. This technique detects lower parasite loads than traditional culture, improving detection rates in clinical settings.
Area of Science:
- Medical Diagnostics
- Parasitology
- Immunology
Background:
- Trichomoniasis diagnosis often relies on culture methods, which may miss low-parasite-load infections.
- Asymptomatic infections pose a challenge for effective public health interventions.
- There is a need for sensitive and practical diagnostic tools for trichomoniasis.
Purpose of the Study:
- To evaluate the efficacy of immunocytochemistry (ICC) for diagnosing trichomoniasis.
- To specifically assess ICC's performance in detecting asymptomatic infections.
- To compare ICC sensitivity and specificity against traditional culture methods.
Main Methods:
- Serial dilutions of Trichomonas vaginalis were used to determine the detection limit of ICC versus culture.
- In vivo detection capability was assessed using vaginal secretions from experimentally infected mice.
- Vaginal swabs from asymptomatic HIV-positive pregnant women were tested using both ICC and culture.
Main Results:
- ICC detected as few as 1 trophozoite/mL, significantly lower than culture's 100 trophozoites/mL.
- In asymptomatic women, ICC identified 10 additional positive cases (25.45%) missed by culture (7.27%).
- ICC demonstrated significantly higher sensitivity (p = 0.002) and specificity compared to culture.
Conclusions:
- Immunocytochemistry is a highly sensitive and specific method for diagnosing trichomoniasis, particularly in low-parasite-load and asymptomatic infections.
- ICC's ease of execution and cost-effectiveness make it a practical routine diagnostic procedure.
- ICC offers a significant improvement over culture for detecting trichomoniasis in all clinical scenarios.
Abstract:
The aim of this study was to evaluate the immunocytochemistry (ICC) to diagnose trichomoniasis, particularly asymptomatic infections. By culture serial dilutions, ICC was able to detect 1 trophozoite/mL, while the culture was positive up to 100 trophozoites/mL. The ICC in vivo detection capability was assessed in vaginal secretions of mice experimentally infected and in vaginal swabs from asymptomatic HIV-positive pregnant women compared with culture. All vaginal secretion samples from mice were positive according to both methods. Swabs from fifty-five asymptomatic women were positive in four (7.27%) of them by culture. Beyond these four, another ten (25.45%) women were positive by immunocytochemistry, proving their higher sensitivity (p = 0.002), noticing 3.5 times more positives. ICC had better performance in both successive dilutions as in asymptomatic women, showing higher sensitivity and specificity. In this way, its facility of execution and cost-effectiveness support its practicality, as a routine procedure to diagnose trichomoniasis not only when the parasite load is lower but probably in all clinical scenarios.
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