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Background  According to the Chagas congenital transmission guides, the diagnosis of infants, born to  Trypanosoma cruzi  infected mothers, relies on the detection of parasites by INP micromethod, and/or the persistence of  T. cruzi  specific antibody titers at 10–12 months of age.    Methodology and Principal Findings  Parasitemia levels were quantified by PCR in  T. cruzi -infected children, grouped according to the results of one-year follow-up diagnosis: A) Neonates that were diagnosed in the first month after delivery by microscopic blood examination (INP micromethod) (n = 19) had a median parasitemia of 1,700 Pe/mL (equivalent amounts of parasite DNA per mL); B) Infants that required a second parasitological diagnosis at six months of age (n = 10) showed a median parasitemia of around 20 Pe/mL and 500 Pe/mL at 1 and 6 months old, respectively, and C) babies with undetectable parasitemia by three blood microscopic observations but diagnosed by specific anti -  T. cruzi  serology at around 1 year old, (n = 22), exhibited a parasitemia of around 5 Pe/mL, 800 Pe/mL and 20 Pe/mL 1, 6 and 12 month after delivery, respectively.  T. cruzi  parasites were isolated by hemoculture from 19 congenitally infected children, 18 of which were genotypified as DTU TcV, (former lineage TcIId) and only one as TcI.    Significance  This report is the first to quantify parasitemia levels in more than 50 children congenitally infected with  T. cruzi , at three different diagnostic controls during one-year follow-up after delivery. Our results show that the parasite burden in some children (22 out of 51) is below the detection limit of the INP micromethod. As the current trypanocidal treatment proved to be very effective to cure  T. cruzi  - infected children, more sensitive parasitological methods should be developed to assure an early  T. cruzi  congenital diagnosis.

plos neglected tropical diseases

How to Improve the Early Diagnosis of Trypanosoma cruzi Infection: Relationship between Validated Conventional Diagnosis and Quantitative DNA Amplification in Congenitally Infected Children