Osteogenesis Imperfecta

Osteogenesis imperfecta (OI)—also referred to as brittle bone disease—is a disorder where a person’s bones are very fragile, causing them to break easily, oftentimes without cause. It is relatively rare, affecting approximately 1 in 20,000 people, and “occurs with equal frequency among males and females and among racial and ethnic groups,” says the National Human […]

The human immune system is exceedingly complex. Rather than an enclosed circuit, like your circulatory system, defender cells occupy every region of your body. Like ogres and onions, it has many layers, some of which overlap. Read on to discover more about how your body fights off bacteria and viruses by use of its natural defense system.