Infectious diseases are illnesses brought on by pathogens, which are dangerous substances that enter your body. Viruses, bacteria, fungus, and parasites are the most frequent culprits. Typically, infectious diseases are passed from one person to another, through tainted food or drink, and through insect bites. Infectious diseases can range in severity from very mild to very serious. Infectious diseases are illnesses brought on by pathogens—dangerous organisms—that enter your body from the outside. Infectious disease-causing pathogens include viruses, bacteria, fungus, parasites, and, in rare cases, prions. Infectious diseases can be contracted from other people, insect bites, contaminated food, drink, or soil. Injurious organisms like viruses and bacteria that enter your body from the outside are what cause infectious disorders. Non-infectious diseases are brought on by factors such as heredity, anatomical variations, aging, and environmental factors rather than by external organisms. Noninfectious diseases cannot be contracted from other people, through a bug bite, or through food. Infectious diseases include the flu, measles, HIV, strep throat, COVID-19, and salmonella. Examples of noninfectious diseases include cancer, diabetes, congestive heart failure, and Alzheimer's disease.
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