Chronic granulomatous disease (CGD) is an inherited (genetic) immune system disorder that occurs when a type of white blood cell (phagocyte) that usually helps your body fight infections doesn't work properly. As a result, the phagocytes can't protect your body from bacterial and fungal infections.
The house was built circa 1939. When used in date ranges, a circa is applied before each approximate date, while dates without a circa immediately preceding them are generally assumed to be known with certainty.
The median age of homes also depends heavily on the area of the country. Homes in the Northeast are older, with a median age of 51 years. This isn't a surprising statistic for old house or history buffs, as homes built in the early to mid-1800s are common in the New England states.