- Filoviridae. Filovirus,an example would be the ebola viruswhich causes
African hemorrhagic fever.
Oncogenic viruses
Oncogenic virusesare viruses that produce tumors when they infect humans.
The more common oncogenic viruses are:- Human papillomavirus (HPV). Human papillomavirus causes common
warts but also is believed to cause cervical cancer. - Epstein-Barr virus (EBV). Epstein-Barr virus causes Burkitt’s lymphoma,
which is a tumor of the jaw. It is seen mainly in African children and causes
a tumor in the nasopharyngeal (nasopharyngeal carcinoma). - Herpes simplex virus 2 (HSV-2). Herpes simplex virus 2 causes genital
herpes, cervical cancer (cervical carcinoma), and oral lesions. - Human T-cell leukemia virus 1 (HTLV-1). Human T-cell leukemia virus 1
causes acute T-cell lymphocytic leukemia,which is a cancer that affects T-
cell–forming tissues. - Human T-cell leukemia virus 2 (HTLV-2). Human T-cell leukemia virus 2
causes atypical hairy cell leukemia.
Plant viruses
Some viruses cause diseases in plants.
RNA plant virus:- Picornaviridae: Includes the bean mosaic virus.
- Reovirus: Includes the wound tumor virus.
DNA plant virus: - Papovaviridae: Includes the cauliflower mosaic virus.
Viroids
In 1971, plant pathologist O.T. Diener discovered an infectious RNA particle
smaller than a virus that causes diseases in plants. He called it a viroid. Viroids(^192) CHAPTER 12 Viruses, Viroids, and Prions