Tests show negative activity from the amoeba in Arkansas boy 's brain . Doctors had given Zachary the same experimental anti-amoeba drug used to treat 12-year-old Kali Hardig recently in Arkansas , the Reyna family told CNN affiliate WBBH . ADH issues warning about amoeba danger in warm freshwater . Family says Kali Hardig is receiving same drugs as Zachary Reyna . Florida girl is in rehab in fair condition , the hospital says .
Tests show negative activity from the amoeba in Arkansas boy 's brain . ADH issues warning about amoeba danger in warm freshwater . Family says Kali Hardig is receiving same drugs as Zachary Reyna . Florida girl is in rehab in fair condition , the hospital says .