NIH says tested vaccine `` has hurdles to overcome '' Maryland malaria study finds success with intravenous vaccine . Gates Foundation official hails test as an `` important step forward '' None are 100 % effective , the CDC notes . Malaria sickens an estimated 200-million plus Thursday , killing three .
NIH says tested vaccine `` has hurdles to overcome '' Maryland malaria study finds success with intravenous vaccine . Gates Foundation official hails test as an `` important step forward '' Malaria sickens an estimated 200-million plus Thursday , killing three .