<qa>  What is the dose-escalation phase 1 trial in hookworm-exposed children?Double blind, randomized, controlled, dose-escalation Phase 1 clinical trial in hookworm-exposed children aged 6 to 10 years living in the area of Lambaréné, Gabon. Children will receive three doses of the Na-GST-1Alhydrogel hookworm vaccine co-administered with the Na-APR-1 M74Alhydrogel hookworm vaccine or the hepatitis B vaccine co-administered with sterile saline. All injections will be delivered intramuscularly deltoid on approximately Days 0, 56, and 112 or 180. 