Presentation on theme: "1 Review Describe how bacteria cause disease Review How do viruses cause disease Relate Cause and Effect Are vaccines effective before or after infection-"— Presentation transcript:
1 1 Review Describe how bacteria cause disease Review How do viruses cause disease Relate Cause and Effect Are vaccines effective before or after infection- explain 2 Review Why are emerging disease of particular concern Propose a Solution What actions could your school take to help combat the evolution of “superbugs” and explain how these actions could make an impact
2 Ch 20 Viruses and Prokaryotes 20.3 Diseases Caused by Bacteria and Viruses
3 Bacterial Diseases Bacteria produce disease in one of two general ways Destroy living cells and tissues of the infected organismRelease toxins (poisons) that interfere with the normal activity of the host cell.
4 All known prokaryotic pathogens are bacteria Microorganisms that cause diseaseAll known prokaryotic pathogens are bacteriaNo archaea are known to be pathogens.
5 Damaging Host Tissue Tuberculosis Inhaled into the lungs Its growth triggers an immune response that can destroy large areas of tissue.
6 Releasing ToxinsBotulismDeadly form of food poisoning.
8 Physical RemovalWashing hands or other surfaces with soap under running water doesn’t kill pathogensIt dislodges both bacteria and viruses.
9 Disinfectants Chemical solutions that kill bacteria Can be used to clean bathrooms, kitchens, hospital rooms, and other places where bacteria may flourish.
10 Food StorageLow temperatures slow the growth of bacteria and keep most foods fresher for a longer period of time than possible at room temperature.
11 Food ProcessingBoiling, frying, or steaming can sterilize many kinds of food by raising the temperature of the food to a point where bacteria are killed.
12 Sterilization by HeatSterilization of objects such as medical instruments at temperatures well above 100° Celsius can prevent the growth of potentially dangerous bacteria.
13 Preventing Bacterial Diseases VaccinePreparation of weakened or killed pathogens or inactivated toxinsPrompts the body to produce immunity to a specific diseaseImmunityBody’s ability to destroy pathogens or inactivated toxins.
14 Treating Bacterial Diseases AntibioticsDrugs used to attack a bacterial infectionBlock the growth and reproduction of bacteriaDisrupt proteins or cell processes that are specific to bacterial cellsDo nothing against viruses.
15 Viral DiseasesAttack and destroy certain cells in the body, causing the symptoms of the associated diseaseCause infected cells to change their patterns of growth and development.
27 More of a Threat Changes in lifestyle and commerce High-speed travel Huge quantities of food and consumer goods are now shipped between regions of the world that previously had little contact with each otherHuman populations that were once isolated are now in close contact with more developed parts of the world.
28 Emerging diseases are of particular concern because of their sudden appearance and resistance to existing control methods.
29 “Superbugs”Bacteria resistant to whole groups of antibiotics and that transfer drug-resistant genes through conjugationResult of natural selection.
30 Methicillin-resistant Staphylococcus aureus MRSASkin infectionsEspecially dangerous in hospitalsInfection can be fatal for people in hospitals and nursing homes.