Hi,
Karen and I are both nurses as well. I used to manage a travel clinic. I don't believe any particular vaccines are needed. That being said,however, all residents of the US should be vaccinated against Hepatitis A. Children are now required in Az day cares to have Hep A vaccines. The reason is because Hep A in children is usually no big deal, a little diarrhea, most parents don't even know the kids have it. The problem comes in when they transmit it to adults who can become very ill. I think the latest statistics are about 1-2% of adults who contract the illness die and the illness can be very long and protracted in others. There has been an increase of Hep A outbreaks in this country because restaurant workers have been known to spread it due to poor handwashing. As stated the best prevention is handwashing but that won't help contaminated food. There is a series of 2 vaccines and you are protected from the day of the first vaccine. Most insurance companies cover the vaccine because it is the standard of care.
I strongly recommend Hepatitis A vaccine and as the previous writer said, Hep B is for those who are staying in the country 6 months or more or have sex or blood exposure with someone who is Hep B positive (they don't need to be sick, only a carrier).