Bacteria and Viruses

It is well documented that some bacteria and some viruses are the causal agents of disease in plants, humans and other animals.  These pathogens are not only distinct from each other but have great diversity even within their own domains.
Briefly ( no more than a few sentences) describe the major differences between bacteria and viruses, this will include information on their basic structure and genetic material.
Choose an example of a bacteria and an example of a virus that can cause illness in humans and compare the contribution each type of organism makes to the disease process. e.g. How they infect and enter the host, what happens to infected cells or tissues, what causes the pathology and how they spread to another host.  Again, this can be fairly brief, it is more important that you understand the general processes involved rather than knowing the fine details. 
Consider the most prevalent infectious diseases around today.  Are they caused by viruses or bacteria? ( this may alter depending on your geographic location) Which one of these types of pathogen ( if either) do you consider to be the more effective in its mechanism of spread and survival and do you consider viruses or bacteria to be a greater threat to the health of modern man?  
Be sure to properly cite any outside sources you use.  You can find help with citations at the Purdue University Online Writing Lab (OWL); https://owl.english.purdue.edu/owl/resource/560/01/
.http://cnx.org/contents/185cbf87-c72e-48f5-b51e-f14f21b5eabd@9.85:1

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