Why are viruses contagious
[PDF File]Factors in the Emergence of Infectious Diseases
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resembled viruses isolated from the sooty m angabey monkey (an animal widely hunted for food in rural areas and the putative source of HIV-2) more closely than it did strains circulating in the city (11). Such findings suggest that zoonotic introductions of this sort may occur on occasion in isolated populations
[PDF File]Rhinovirus: How it Infects Humans
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viruses that causes up to 40 percent of common cold cases in humans.1 The common cold leads to many different symptoms, however, most colds are generally considered to be an infection of the respiratory tract. “Rhino” comes from the Greek word for “nose” which is a typical way for the virus to get into the body. The
Colds and Coughs in Adults: Managing Viral …
Why won’t my doctor give feel better, and when to see your doctor. This fact sheet me antibiotics? • Antibiotics kill bacteria, not viruses. Colds and most coughs and sore throats are caused by viruses. Antibiotics will NOT cure viruses, and they will NOT help someone with a viral infection feel better faster.
[PDF File]Chapter six - Viruses v2
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Highly contagious and spreads from person to person primarily by: (i) droplets or aerosols expelled from the throat of infected persons, and ... which is why viruses need the help of a host to function. The genes contained in the viral genome are limited to those used to build more viruses (structural genes). ...
[PDF File]DISEASE IN HUMAN EVOLUTION: THE RE …
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is informative, those diseases that would have been absent are also of interest. The contagious community diseases such as influenza, measles, mumps, and smallpox would have been missing. There probably would have been few viruses infecting these early hominids, although Cockburn (1967) disagrees and
[PDF File]Communicable Diseases Interior - Board of …
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contagious illness that is spread from person to person or from animals to people. There are several kinds of organisms that cause communicable diseases: bacteria, viruses, parasites, and fungi. Infection may occur if: •• There is a harmful organism present (bacteria, virus, parasite, or fungus) in large enough numbers.
[PDF File]Understanding Common Communicable Diseases
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Influenza, commonly called “the flu,” is a contagious disease caused by viruses that infect the respiratory tract, including nose, throat, and lungs. It can cause severe illness and life-threatening complications in many people including the elderly. Flu symptoms include fever, cough, sore throat, runny nose, headache, muscle aches, and ...
[PDF File]THE RESPIRATORY VIRUSES: INFLUENZA, RSV, AND …
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the year-to-year variation in influenza viruses and is the reason we need to keep changing the makeup of the influenza vaccine. Antigenic Shift: Because the RNA genomes of influenza viruses are segmented they can undergo reassortment (mixing up) if two different influenza viruses infect the same cell. This concept is very important in
[PDF File]Climate change and infectious diseases
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Both the infectious agent (protozoa, bacteria, viruses, etc) and the associated vector organism (mosquitoes, ticks, sandflies, etc.) are very small and devoid of thermostatic mechanisms. Their temperature and fluid levels are therefore deter-mined directly by the local climate. Hence, there is a limited range of climatic
[PDF File]Bloodborne Pathogens
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The viruses that cause Hepatitis B Virus (HBV) and Human Immuno-deficiency Virus (HIV) are two examples of bloodborne pathogens. For a bloodborne pathogen to be spread, the bodily fluids of an infected person must enter into the bloodstream of …
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