As the world marks World Hepatitis Day, we’re shining the spotlight on a global health crisis that often goes unnoticed. The World Health Organization reports that over 350 million people worldwide are living with hepatitis B or C, and most are unaware of it.

Here in Nigeria, hepatitis B is especially prevalent, with many cases detected only when it’s too late.

Guardian Nigeria spoke with Dr. Balogun Olaide, a public health practitioner, to help us understand what hepatitis is, how it spreads, and the steps we all can take to stay safe.