Natural Science Unit 3. Health and illness.
Hello everybody! Merry Christmas and Happy New Year! Here it is the main information of the first part of Unit 3 so that you can study little by little. After Christmas we will complete it with the rest of the Unit. See you on January! INFECTIOUS DISEASES Infectious diseases are caused by harmful organisms called pathogens , such as bacteria and viruses. The body reacts against the infection causing fever and inflammation , which are symptoms of infection. An infectious disease is considered contagious if it is easily transmitted from one person to another. Infectious diseases are treated with antibiotics or antivirals . Some harmful bacteria cause diseases such as salmonellosis, tetanus or conjunctivitis. Some viruses cause diseases such as flu, chickenpox, common colds, malaria, papilloma or AIDS . NON- INFECTIOUS DISEASES Non-infectious diseases are not caused by organisms so they can´t be spread from one person to another