The Threat Of Human Immune System

1833 WordsJan 12, 20158 Pages
The word pathogen comes from the Greek words pathos , meaning to suffer and genus to cause. Indeed a pathogen can be defined as an agent causing disease in the host. Although the human immune system has evolved to deal with encountered infectious agents, the pathogens evolve alongside making it a race of who stays on top. Looking at the variety of the modern worlds disease-causing agents one could say, that perfect pathogens will be those, that remain an issue despite human efforts to eradicate them or those that cause the most death cases. Yet the pathogens only purpose is to multiply in number and spread, thus one could be looking at the number of new cases as a possible measure of pathogenicity. A perfect pathogen should be easily transmitted, undetectable and increase its number in short time. Therefore characteristics such as transmission, diagnosis and life cycle will be crucial while thinking of a perfect pathogen. Some of the pathogens nearly reach perfection in one or two of the categories mentioned. Viruses are very close to perfection, in terms of pathogenicity. They are easily transmitted, replicate fast and are incredibly small. Viron particles have a very simple structure. They consist of a nucleic acid contained in a protein capsid which together forms the nucleocapsid. The capsid enclosing the genetic material is encoded by few proteins forming usually an icosahedral structure. Some viruses have an additional coating layer, a membrane originating from a host
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