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The germ theory of disease proposes that invisible microorganisms (bacteria and viruses) are the cause of particular illnesses in both humans and animals. [2] Prior to medicine becoming hard science , there were many philosophical theories about how disease originated and was transmitted.
A representation by Robert Seymour of the cholera epidemic depicts the spread of the disease in the form of poisonous air.. The miasma theory was the predominant theory of disease transmission before the germ theory took hold towards the end of the 19th century; it is no longer accepted as a correct explanation for disease by the scientific community.
Ebola, also known as Ebola virus disease (EVD) and Ebola hemorrhagic fever (EHF), is a viral hemorrhagic fever in humans and other primates, caused by ebolaviruses. [1] Symptoms typically start anywhere between two days and three weeks after infection. [3] The first symptoms are usually fever, sore throat, muscle pain, and headaches. [1]
Pre-existing theories of disease: Before a pathogen is well-recognized, scientists may attribute the symptoms of infection to other causes, such as toxicological, psychological, or genetic causes. Once a pathogen has been associated with an illness, researchers have reported difficulty displacing these pre-existing theories.
There are three major theories about the origins of viruses: [16] [17] Regressive theory Viruses may have once been small cells that parasitised larger cells. Eventually, the genes they no longer needed for a parasitic way of life were lost. The bacteria Rickettsia and Chlamydia are living cells that, like viruses, can reproduce only inside ...
If a person infected with the Ebola virus rides the subway and has a body fluid (such as mucus from sneezing) on his or her hand, and then touches the railing on a subway, the virus can live up to ...
In particular, "Ebola virus" does not have an official meaning recognized by ICTV, and rather they continue to use and recommend only the species designation Zaire ebolavirus. [ 52 ] The threshold for putting isolates into different species is usually a difference of more than 30% at the nucleotide level, compared to the type strain .
Ebola virus is found in a variety of bodily fluids, such as breast milk, saliva, stool, blood, and semen, rendering it highly contagious due to ease of contact. Although a few transmission methods are known, there is a possibility that many other methods are unknown and must be further researched.