Chicken pox (Varicella)- If you’ve previously had the chicken pox you have immunity and do not need to be concerned. If you have never had the chicken pox, you should notify us and avoid exposure to anyone with the chicken pox. Fifth Disease- Also known as ParvoVirus. About half of all adults have antibodies to it. Infection during pregnancy can be a concern. You should notify us if you think you may have been exposed.