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The germ theory of disease is the currently accepted scientific theory for many diseases. It states that microorganisms known as pathogens or "germs" can cause disease. These small organisms, which are too small to be seen without magnification, invade humans, other animals, and other living hosts. Their growth and reproduction within their ...
Globalization can benefit people with non-communicable diseases such as heart problems or mental health problems. Global trade and rules set forth by the World Trade Organization can actually benefit the health of people by making their incomes higher, allowing them to afford better health care, but making many non-communicable diseases more ...
In epidemiology, environmental diseases are diseases that can be directly attributed to environmental factors (as distinct from genetic factors or infection). Apart from the true monogenic genetic disorders , which are rare, environment is a major determinant of the development of disease.
With their potential for unpredictable and explosive impacts, infectious diseases have been major actors in human history. [95] A pandemic (or global epidemic) is a disease that affects people over an extensive geographical area. For example:
Parasitism in disease ecology is important because it can shape the way many habitats function because they are disease carriers. These diseases can alter the timing of events, biogeochemical cycles , and even the flow of energy in a habitat. [ 10 ]
Scientists have warned a “zombie deer disease” could spread to humans after hundreds of animals were infected with the illness in the US over the last year.. Chronic wasting disease (CWD ...
A lifestyle disease is any disease that appears to increase in frequency as countries become more industrialized and people live longer, especially if the risk factors include behavioral choices like a sedentary lifestyle or a diet high in unhealthful foods such as refined carbohydrates, trans fats, or alcoholic beverages.
That's because "mad cow disease" affected a population relatively easy to control: farmed cattle. CWD, on the other hand, can affect both farmed and free-range animals, making total control ...