contagious diseases

Contagious diseases are illnesses that can spread from one person to another through direct contact or by sharing air, surfaces, or bodily fluids. Common examples include the flu, common cold, and COVID-19. They are usually caused by pathogens like bacteria or viruses. Contagious diseases can be transmitted in various ways, such as through sneezing, coughing, or touching contaminated surfaces. Preventative measures include good hygiene practices, vaccination, and avoiding close contact with infected individuals. Understanding how these diseases spread helps in controlling outbreaks and protecting public health.