Human infectious diseases

Human infectious diseases are transmitted in different ways. There may be cases of infection through direct person-to-person contact. There is also the possibility of contagion from animal to person, which is called zoonosis, and it is estimated that more than 60% of the diseases in the world are of this type. Another way of contagion is from mother to fetus. Indirect infection can also occur by touching an object that contains germs, by insect bites, and by contaminated food and water.