What are three rules of epidemics?

Three key rules of epidemics include the following: First, Infectious Diseases spread through contact, whether direct or indirect, highlighting the importance of human interactions in transmission. Second, the basic reproduction number (R0) indicates how many people one infected person will, on average, infect; if R0 is greater than one, an outbreak can grow. Lastly, effective public health interventions, such as vaccination and social distancing, can significantly reduce transmission and control the spread of the disease.