The difference between these three types of zebras is only about where do zebras live and the answer is that they live at different places. One type of zebra wants to live on mountains and is known as a mountain zebras. Second type lives on plain, grassy lands and is called as Burchell's zebras. Third type of these animals is better known as Grevy's zebras. These zebras are the largest of all three types of the species.
Other viruses can also cause hepatitis (hepatitis A virus, for example), but only HBV and HCV can cause the long-term (chronic) infections that increase a personâs chance of liver cancer. In the United States, less than half of liver cancers are linked to HBV or HCV infection.iruses that can lead to cancer. Viruses are very small organisms; most canât even be seen with an ordinary microscope. They are made up of a small number of genes in the form of DNA or RNA surrounded by a protein coating.
Today, it is estimated that viruses are responsible for almost 20 percent of cancer cases worldwide. Seven viruses have been connected to specific types of malignancies; itâs now known, for example, that the human papillomavirus (HPV) causes cervical cancer and some types of head and neck cancer.While viruses can cause cancer in a variety of ways, the actual mechanisms fall into two broad categories.In the direct method, oncoviruses (cancer-causing viruses) infect normal cells and slip some of their genes into the cellsâ DNA, causing the cells to produce a few abnormal proteins.n 1958, when scientists linked an aggressive form of leukemia to infection with a particular virus, some researchers took the discovery as evidence that nearly all cancers are caused by viruses.