Can I still eat my food after it's walked over by ants?

I’ve noticed that ants were invading my pizza today and they walk on it when I left it for awhile. I drove them away(every piece of them) but I’m not sure if it’s okay to eat my pizza. We know studies has shown that ant is a clean creature(they often clean themselves),but I’m not sure if I think about what they’ve been going through,since they live underground they’ll carry microscopic organism along with them(worm eggs,bacteria,virus,etc) and I’m not sure if the way they clean their body part is really that effective toward all those dangerous microorganism,plus we can’t tell whether or not they have cleaned themselves before they walks on our food. So,can I really eat this food?.