Infectious diseases can be caused by a variety of pathogens. This includes bacteria, viruses, fungi, and parasites, which can cause disease and illness. For humans, disease transmission can occur in a number of ways: person-to-person, water- or food-borne diseases. or particles contaminated by aerosols in the environment As well as through insects (mosquitoes) and ticks anyone can get the disease. (the immune system does not work properly) are more prone to certain types of infections. Infectious diseases are very common all over the world. Some infectious diseases are more common than others, for example in the United States. Every year, one in five is infected with the flu virus. Infectious diseases are spread in a variety of ways, and in many cases through direct contact with the patient, whether through skin contact (including sex) or by touching something the other person can touch. Pain is transmitted to the new host, and exposure to bodily fluids, such as blood and saliva, contributes to the spread of infectious diseases. Some diseases are transmitted by airborne droplets released from the patient's body when the patient coughs or sneezes. These droplets stay in the air for a short time, fall on the skin of a healthy person or breathe into his lungs, and in some cases infectious diseases in the form of microscopic particles spread through the air for a long time. Healthy people inhale these particles and eventually become ill. Few diseases are transmitted by airborne droplets. Including tuberculosis and rubella virus.
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