Physical and Chemical Agents Pose a Threat to Human Health but Biological Agents are Most Severe

Fungi, algae and protozoa). Infectious prions can even exacerbate brain tissue and can be transmitted from the host to the host. It is well known that biological products can become very dangerous if not handled properly. Recognizing the epidemiological transition from infectious diseases to chronic diseases, treatment has been going a long way. However, pathogens are not always avoidable, infections are the most important factor of human death. (Gupta Lecture, 21 January 2014) Chemical and physical factors also have a major health impact.

Water pollution is defined as the existence of toxic chemicals and biological substances in groundwater beyond natural substances in water, which may pose a threat to human health and the environment. In addition, water pollution may contain chemical substances that are taken into water bodies by various human activities. Regardless of health and environmental impact, these chemicals can contaminate water any number of times. Many chlorinated solvents commonly used in the industry (PCE, TCE, 1,1,1-TCA, etc.) are examples of such chemicals that contaminate our bodies only by human activity . Another example is MTBE (methyl tert-butyl ether), a gasoline oxygenate currently banned in the United States.

Arbitrary in the environment caused by human activities or natural processes that may affect the health of exposed subjects, including heavy metals, pesticides, biological contaminants, toxic wastes, industrial pollutants, etc. Single or combined toxic chemicals. And household chemicals. Although human-induced harm does not harm health quickly, deterioration of the environment will have a secondary and unnecessary negative effect on human ecosystems, so that they eventually have a negative impact on human happiness There is a possibility. The effect of water pollution may not be immediately apparent due to the sewer system that helps to remove harmful substances. However, if these substances are left behind (such as persistent organic pollutants), they will be gradually fed back to producers through the food chain of plankton -> food fish -> human beings. In this regard, the considerable environmental hazard listed below is an artificial (personal) hazard.

Hazard characterization: qualitative and / or quantitative assessment of the nature of adverse reactions related to biological, chemical and physical factors that may be present in food. For chemical reagents, it is necessary to conduct dose response assessment. For biological or physical factors, dose response assessment should be performed if data is available. WHO has long provided the Codex and Member States with risk assessment of food, especially chemicals. The FAO / WHO Joint Expert Committee on Food Additives (JECFA) and the FAO / WHO Pesticide Residual Joint Conference (JMPR) are considered to be at the forefront of scientific knowledge for assessing chemical risks in food It is. Through the Global Environment Monitoring System / Food Program, WHO plays a leading role in promoting the collection, comparison and evaluation of chemical data in food and total food at regional and international levels.