Germ sources are substances that can cause disease. One example of a germ source is cereals, which are grains used to make food products such as bread, pasta, and breakfast cereals. Cereals are a common source of germs because they are often grown in large fields and can be exposed to bacteria, fungi, and other microorganisms. Additionally, cereals can be contaminated with pesticides and other chemicals during processing. Therefore, it is important to take precautions when handling and consuming cereals to reduce the risk of illness.