Health-state of complete physical and mental wellbeing and not merely the absence of disease Disease-condition that disturbs, or has the potential to disturb the bodies functions Infectious disease-caused by a pathogen Non-infectious disease-caused by a malfunction of the body Contagious-easily spread Non-contagious eg. Oppurtunistic infections Pathogens-disease causing organisms Micro-organisms-too small to be seen Macrorganisms-can be seen with eye Endoparasites-live in body eg worms Ectoparasites-live outside body eg. Lice Pathogens are parasites that cause disease Bacteria-infect …showed first 75 words of 360 total…

…showed last 75 words of 360 total…Vaccination-the act of receiving a substance so that the body will develop immunity to a specific disease. Water treatment- Primary-screening and degritting (removal of large debris and grit) <Tab/>-flocculation (mix water with chemicals to form suspended particles) <Tab/>-sedimentation (suspended particles settle <Tab/>-sludge processing (solids and liquids are processed) Secondary-filtration (removal of microbes and fine mud) Tertiary-fluoridation and chlorination (add chemicals)