For many years witnesses were reluctant to take some vacinations because some of them had blood "fractions". Missionaries were required by the different governements to get vacinations, and were told by WTBTS that if they did not get the vacinations they could not go to their assignments.
I have seen different periodicals write positive and negative articles about the same subject, when the truth comes out they can point out how they were correct, when actually they just covered their arse.