TAILIEUCHUNG - Societ english3

Tham khảo tài liệu 'societ english3', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | PERSONAL AND SOCIAL PERSPECTIVES IN SCIENCE Infectious Disease Diseases are caused by pathogens that invade a host body. Pathogens need a host in order to survive and multiply. Some examples of pathogens are bacteria viruses and fungi. They can spread through direct body contact body fluids and contact with an object that an infected person has touched some viruses like the common cold virus can exist outside the body for a brief period before they get passed on to another host . Tuberculosis is also an infectious disease. Victims of tuberculosis cough up blood from their lungs. Treatment and vaccines for tuberculosis exist and this disease has been almost eliminated in some parts of the world. However the total number of people in the world infected with tuberculosis keeps growing. Noninfectious Disease If the disease cannot spread from person to person then it is considered noninfectious. Two examples of nonin-fectious diseases are cancer and heart disease. Here are some characteristics of noninfectious diseases They do not transfer from person to person. They are not caused by viruses bacteria or fungi. They are sometimes hereditary meaning that they are associated with genes and run in families. Noninfectious diseases can be classified further Hereditary diseases. Hereditary diseases are caused by genetic disorders passed down from previous generations. Since they are inherited they are more difficult to treat because they are a part of the body s genetic makeup. Age-related diseases. Some diseases will start to develop as the body gets older. As the body grows old it does not work as efficiently to battle routine diseases and degenerative diseases such as Alzheimer s disease which causes mild to severe memory loss or distortion forgetfulness anxiety and aggressive behavior. Environmentally induced diseases. An environment that has been polluted with toxins and hazardous waste can affect the population living in or around it. Radiation from toxic waste can .

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