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Lecture 7

EESA10 Lecture 7

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University of Toronto Scarborough
Environmental Science
Jovan Stefanovic

EESA10 Lecture 7Biological Hazards and Human HealthThis lecture overlaps with next lecture on Food and Food borne Diseases because they both have same agents bacteria viruses These can be considered as biological hazards but also they can found in food substances and cause food borne hazards Biological HazardsBiological Hazards can be nontransmissible cannot be transferred from one human to another human Examples of such nontransmissible diseases include cardiovascular cancer diabetes asthma What are cardiovascular diseases These are diseases related to heart as a result of food high cholesterol lack of exercise lots of stress smoking etc Cancer has many different causes we cannot specify just one cause for it Every cancer is caused with many different agents environmental genetical etc There is no strong proof that these diseases can be transferred from human to human Diabetes can be caused because of genetics food and obesity There is no strong evidence that diabetes can be transferred from human to human Asthma is closely related with some allergens something in our environment Everyday many new agents and chemicals and applied to us and they may cause asthma There is no proof that asthma can be transmitted from human to human Transmissible diseases Diseases caused by bacteria viruses or protozoa can be certainly transferred from humans to humans Bacteria can be cured using antibiotics Antibiotics are medicine that we take if we have bacterial infections However Antibiotics do not work with viral infections For example doctors will not prescribe antibiotics if you have flu or some other kind of viral infection If you take antibiotics for any viral infection or any other infection you will be overusing antibiotics using antibiotics when we do not need it or not prescribed by the doctor or taking antibiotics more frequently for not very serious disease What will happen as a result This can lead to very significant resistance of bacteria to these antibiotics Next time if someone is really serious and needs antibiotics those antibiotics will not work This is because growing germ produces resistance to antibiotics How do the bacterias develop resistance This is because they are growing very fast They reproduce very quickly Also they very quickly transfer that mutation that adjustment to the next generation This process goes through generation to generation very quickly much faster than any other organism on the planet can do High reproductive rate allow them to become genetically resistant quickly One more reason why bacterias grow resistance to antibiotics is because of the use of antibiotics in food additives to boost livestock Veterinarians agriculture specialists farmers they all use antibiotics to prevent diseases in animals Farmers use antibiotics to prevent disease from happening and if we consume that kind of meat with high concentration of antibiotics we might become more resistant to antibiotics Biological HazardsBacterial Diseases1 Tuberculosis When we talk about this disease we always think about the past before World War 2 before discovery of antibiotics This was a big problem However it seems that this is not the case Even today it is a significant threat to humans But indeed this is a
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