I have serious doubts about the validity of this report.
Still, I would like to see some first world labs check the vaccine. It seems a lot of effort for the result.
As the doctors themselves pointed out, what possible reason would they have to lie? Catholic doctors have been working there for a century and have routinely been giving vaccines for decades. There is no conceivable reason why they would make this up.
And, this would not be the first time. In the 1990s the UN was found to have put hCG in tetanus vaccines in the Philippines, Mexico and Nicaragua.