3 What Causes Infectious Diseases? Small microscopic organisms, also known as pathogens.Pathogens invade the body and attack its cells and tissues.Pathogens take many forms including Viruses, Bacteria, Rickettsias, Protozoan, and Fungi.
4 How Infectious Diseases are spread….. 1.) PeopleDirect ContactIndirect Contact2.) Animals3.) Contaminated Objects4.) Environment
5 The Body’s Barriers Against Disease Innate Immune System1.) Mucous Membranes2.) Enzymes in tears and saliva3.) Unbroken skin4.) Digestive juices5.) White blood cells
9 Infectious Diseases, cont. Nervous System1.) Encephalitis- virus; inflammation of the brain2.) Meningitis- viral and bacterial; inflammation of membranes that cover the brain and spinal cord3.) Poliomyelitis- polio; caused by a virus
10 Other Diseases 1.) Measles- viral 2.) Mononucleosis- viral; spreads through direct contact, mostly“kissing disease”3.) Hepatitis- mostly viralA- results from eating food or drinking water that has been contaminated; vaccine available.B- more serious than A; spread through contaminated medical instruments, sexual contact with an infected person, and shared needles by infected drug users; vaccine available.
11 Other Diseases, cont.C- spread through infected blood; can cause liver cancer; no known cure; no vaccine.
12 Common Sense Measures 1.) Overall good health 2.) Bathe or shower daily3.) Avoid sharing eating or drinking utensils4.) Store and prepare food in a safe way5.) Wash your hands6.) Cover your mouth when sick, avoid giving disease to someone else7.) If you are well, avoid contact with sick people
13 ConclusionTypes of pathogensTypes of diseasesCommon senses measures