The Bill and Melinda Gates Foundation (whose name you didn't actually know when you went looking for a citation, I notice) is not a charitable organization, it is a vessel for spreading evil and oppressive IP law across the globe while pretending to do something about Malaria and other diseases which cannot possibly be wiped out without access to more countries than they will gain access to under their terms.
If you want immunizations from the Gates foundation you will have to grant strong IP protection to pharmaceutical companies. So strong, in fact, that should your people be dying and should you be able to manufacture the drug that will save them yourself, you will find the WTO and the world bank up your ass in a second if you do so instead of paying Big Pharma literally any price they demand for it.
Meanwhile, the foundation makes many investments in corporations and industries which are killing many of the people they are claiming to try to help. When they were caught doing this they issued a press release saying they would review their investments for ethical content. Then the press release disappeared from their website. Then they issued a new one that said that they would not be reviewing their investments because it involves time and effort. This conclusively proves that in fact they do not give one tenth of one fuck about anyone; not you, not me, not people dying of Malaria. Their goals are entirely commercial and they have suckered not just you, but millions of others.
What on earth made you think that Bill Gates suddenly was not a willful repeat criminal, essentially a real-life super villain? He's a persian cat and a monocle away from trying to fry people's nuts with fancy cutting equipment.
If you really wanted to know about the gates foundation, you could ask google. Instead of just searching for their name, which is how you get a bunch of official PR and the crap that the mainstream media has decided to repeat ad infinitum, try prefixing it with "problems with" and see what happens. It's amazing what you can find out when you actually try.