Until now, Johnston said, only vaccines featuring live, though weakened virus with risk for causing disease in humans were able to contain severe viral challenges in monkeys as well as this vaccine.
(only vaccines; featuring live; ) (only vaccines featuring live, though weakened virus with risk for causing disease in humans; to contain; severe viral challenges in monkeys as well as this vaccine) (Johnston; said; only vaccines featuring live, though weakened virus with risk for causing disease in humans were able to contain severe viral challenges in monkeys as well as this vaccine; T:Until now) Context(Johnston said,List([11, 24))):(only vaccines featuring live, though weakened virus with risk for causing disease in humans; were; able to contain severe viral challenges in monkeys as well as this vaccine)
Johnston said,List([11, 24))
only vaccines only vaccines featuring live, though weakened virus with risk for causing disease in humans Johnston only vaccines featuring live, though weakened virus with risk for causing disease in humans
featuring live to contain said were
severe viral challenges in monkeys as well as this vaccine
only vaccines featuring live, though weakened virus with risk for causing disease in humans were able to contain severe viral challenges in monkeys as well as this vaccine T:Until now
able to contain severe viral challenges in monkeys as well as this vaccine