How is it transmitted: "This can happen through sexual contact; sharing needles, syringes, or other drug-injection equipment; or from mother to baby at birth. "[1]
Why do I need it? My kid's doctor paraphrased: um, chart says so and school won't her in if she does not have it.
And that does not mention super annoying conversation with wife, whose entire argument for it is: 'it won't do damage'.