C is Blood only from what I know as well. There is no vaccine and it results generally in giving you liver cancer.
I'm not positive on how long the shots last, but I'll try and look it up when i get home and have access to my books and post here.
It should be noted that you don't always "take" to the vaccine, that is, your body won't devlop the necessary immunity to the disease. There are tests to see whether or not it worked, but generally that's only done if you are in a high risk situation, like working at a hospital or something.
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