One of the people behind the Pfizer-BioNTech COVID-19 vaccine says he has yet to see any evidence that emerging variants of the disease have found a way to defeat it. "The second concern is that variants potentially could escape existing immune responses." To address the second concern, BioNTech's team of researchers run tests on the vaccine's effectiveness against individual variants. "We do not have any evidence that our vaccine would not work against any of the prevalent variants." BioNTech is also researching possible risks the Pfizer-BioNTech vaccine might present to pregnant women.

Source: CBC News May 04, 2021 21:18 UTC