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[Neonatal Chagas disease: laboratory diagnosis during the first year of life]
Insights
Congenital Chagas disease diagnosis in infants is reliable using parasitologic and serologic methods. This approach accurately identifies infected newborns, preventing unnecessary treatment for those with only maternal antibodies.
Area of Science:
- * Infectious Diseases
- * Parasitology
- * Pediatric Medicine
Context:
- * Chagas disease, caused by Trypanosoma cruzi, poses a significant risk of congenital transmission from infected mothers to newborns.
- * Accurate early diagnosis of congenital Chagas disease is crucial for timely intervention and preventing long-term complications.
- * Distinguishing between true infection and passive transfer of maternal antibodies in infants is a diagnostic challenge.
Purpose:
- * To evaluate the efficacy of combined parasitologic and serologic methods for diagnosing congenital Chagas disease in infants.
- * To establish diagnostic criteria for congenital and neonatal Trypanosoma cruzi infection within the first year of life.
- * To assess the correlation between parasite detection and antibody persistence for reliable diagnosis.
Summary:
- * A study of 721 infants born to mothers with Chagas disease utilized Strout, blood culture, Xenodiagnosis, and placental examination for parasite detection.
- * Serologic tests (CFT, IHA, IIF) and total Ig quantification were employed to detect Trypanosoma cruzi antibodies.
- * Results demonstrated a strong correlation between parasite detection and antibody persistence beyond six months, confirming congenital infection in some infants and ruling it out in others who cleared maternal antibodies.
Impact:
- * The described methodology is accessible to medium-complexity laboratories, enhancing diagnostic capabilities for congenital Chagas disease.
- * Accurate diagnosis prevents the unnecessary administration of trypanocidal drugs to uninfected newborns passively carrying maternal antibodies.
- * Reliable early detection facilitates appropriate management and improves outcomes for infants with congenital Chagas disease.
Abstract:
This paper describes the parasitologic and serologic studies carried out during the first year of life in 721 pediatric patients born to mothers serologically positive for Chagas disease. The search for circulating trypomastigotes was performed by Strout, blood culture and/or Xenodiagnosis. In some cases, amastigotes were also detected in placenta and umbilical cord. Complement fixation test, indirect hemagglutination and indirect immunofluorescence were used to detect Trypanosoma cruzi antibodies. The dosage of total Ig by single radial immunodiffusion was also carried out. The results obtained showed an absolute correlation between parasite detection and the persistence of antibodies after six months of life. In the first group (GI) formed by 8 children, the diagnosis of congenital infection could not be confirmed because the isolation of T. cruzi was obtained only in later studies. In another 8 children grouped in GIII, it was impossible to detect parasitemia, and the diagnosis was reached by the serological positivity after six months of life. Finally, in 684 patients with anti-T. cruzi antibodies at birth, the serology became negative at the age of 3 months (GIV) or 6 months (GV). The methodology employed in this work is accessible to laboratories of medium complexity, and permits the diagnosis of congenital or neonatal chagasic infection with a high degree of reliability. On the other hand, it avoids unnecessary administration of trypanomicide drugs in a number of newborn and infants who have only received maternal antibodies at birth and were not infected by T. cruzi.