Rubella (German Measles) is a highly contagious viral illness with symptoms very similar to rubeola (red measles, commonly referred to simply as "measles") but differs in the severity of symptoms and length of illness. The most serious threat of rubella is to the pregnant female who has never had rubella. If exposed to rubella, she can contract the disease which can cause serious problems for the unborn baby.

Parvovirus B19

Parvovirus B-19 infection is also known as Fifth Disease. Fifth Disease is usually a mild illness that resolves without medical treatment among children and adults who are otherwise healthy. However, pregnant women who are infected with Parvovirus during early pregnancy have a 5% risk of miscarriage. (Also see article Parvovirus B19 Exposure in Pregnancy.)