This is about a very old certificate from when these diseases actually existed in some parts of the world. The question is why it still exists. They can easily update it if they want.
Imo,only clueless people uses agents.I have my money (+ some more) for immigration in an FDA at Bangkok Bank.But I also have money back home since many years in both an FDA and savings accounts. It's a perfect setup for me.
Do as he said,go for the Non-O, not the O-A. The ONLY benefit with the O-A is the possibility to use the required amount of money for the first year in a bank back home. All the rest sucks big time. Believe me.