I'll never understand why infants are vaccinated for Hep B, when generally only adults who use IV drugs or have multiple sex partners are at use. My infant daughter was given this vaccine at three mos. along with several others, and the toxic load caused her to have a reaction, including fever and listlessness, which at the time I didn't report, as my doctor told me such things were "normal." This is a totally unnecessary vaccine, which should never be given to a child, especially one not at risk for Hep B, as most are not at risk, and especially as it is one that still contains mercury.