@SZapper - Dehydration during pregnancy is definitely not desirable. I'm glad your friend is ok though!
I remember my mom telling me that at one point she was really concerned about getting developing Epstein-Barr when she was pregnant. When she was in high school, my mom came down with a pretty bad case of mono. Like the article said, the virus can reactivate during pregnancy.
My mom is a big worrier, but luckily this time her worries were unfounded! She didn't develop Epstein-Barr during either of her two pregnancies.