Viruses are intracellular parasites that obliged to live in need of a living cell. The virus is the Virion , which may contain DNA (deoxyribonucleic acid) or RNA (ribonucleic acid). In this way we can classify the virus DNA or RNA. DNA viruses generally have a double-stranded DNA wrapped around itself, while the RNA has a single RNA molecule. There are also human retrovirus , such as HIV and T-cell leukemia Viruses are also made from Capsid , an envelope protein consists of 5 / 6 units called capsomeres. Among DNA viruses include Herpes Simplex Virus and Zooster, the smallpox virus, papilloma virus, RNA viruses are the influenza, rubella, measles.
Viral infection is manifested by the attachment of the virion to the cell membrane. Following is the penetration, with the insertion of nucleic acid in the host cell nucleus, leading subsequently to cell lysis. Once the DNA is transcribed, the host cell dies and gives way to the virus.
Examples of viruses:
poxvirus - smallpox
Herpes virus - Herpes Simplex, Varicella Zooster, Epstein Barr, Cytomegalovirus
Adenovirus
Parvovirus - Virus rats
Rabdovirus - rabies, vesicular stomatitis
Togavirus - yellow fever, dengue virus
Rubellavirus - rubella
picornaviruses - poliomyelitis and enteric viruses
Leucovirus - cancer, Rous sarcoma, leukemia in rats
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