Children with light, moderate, and heavy infections had baseline plasma IL-10 levels of 93 ± 75, 88 ± 61, and 80 ± 51 pg/mL, respectively (mean ± SE for 73, 50, and 41 children, respectively), with no significant differences related to intensity of S. mansoni infection or affliction with Ascaris or Ankylostoma. Here, IL10 is linked to infection.