A spokesman for Cardiff and Vale University Health Board said: "Vaccination is an important way to help prevent hepatitis A from spreading. A spokesperson for the Health Board also emphasised that good hand hygiene also helps prevent the spread. According to Public Health Wales, Hepatitis A is a viral infection that affects the liver and can be prevented with a vaccine. It is primarily spread through contaminated food and poor hand hygiene, but can also be acquired through sexual contact. Public Health Wales advises that good hand hygiene is key to preventing transmission.