And then, in one of the most important, tenacious and toughest reservoirs of the polio virus in the world, we found that our vaccine was working half as well as it should have.
Kemudian, di salah satu sumber virus polio yang paling penting, paling ulet, dan paling sulit di dunia, kami menemukan bahwa vaksin kami bekerja hanya setengah dari yang seharusnya.