A 6 year old boy was taken to the emergency department because of a high fever. The fever began about 10 days before. Exam revealed a temp of 103°F. A CBC, UA, and blood culture were ordered. RBC 2.9 X 1012/L Hgb: 9.5g Hct: 27% WBC: 10,000 x 10 12/L Bands: 10% Neut: 59% Lymphs: 21% Monos: 10% Platelets: 95,000 x 109/L Plt. Distribution was decreased. RBC morphology was normal. Serology specimens reported acute polyclonal (indirect fluorescent antibody) for E. equi was nonspecific. Another specimen acquired 23 days later was positive (titer 1:320). Five months later, the IFA for E. equi was positive for IgG (1:264), but the IgM component was < 1:20. IgM and IgG titers for E. chaffeensis were negative. Which serological assays were significant in establishing a diagnosis? (1) Is this confirmation of human granulocytic ehrlichiosis? (1) Is HGR more common in children than adults? (1)