A true pilonidal sinus in the hand of a sheep shearer. 2) Uncommonly, the cyst may become secondarily infected, resulting in osteomyelitis with formation of an abscess and draining sinus to the overlying skin. Echinococcal disease of the bone: an unusual cause of a pathological fracture.
Tobacco mosaic virus (TMV) is a positive-sense single stranded RNA virus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae.The infection causes characteristic patterns, such as  mosaic -like mottling and discoloration on the leaves (hence the name).TMV was the first virus ever to be discovered.Although it was known from the late 19th century that an infectious disease was damaging tobacco crops, it was not until 1930 that the infectious agent was determined to be a virus.he infection causes characteristic patterns, such as  mosaic -like mottling and discoloration on the leaves (hence the name). TMV was the first virus ever to be discovered.
Some of these factors include the host's genetic makeup, mutation occurrence, exposure to cancer causing agents, and immune impairment. Viruses typically initiate cancer development by suppressing the host's immune system, causing inflammation over a long period of time, or by altering host genes.NA Viruses. 1  The Epstein-Barr virus has been linked to Burkitt's lymphoma. 2  The hepatitis B virus has been linked to liver cancer in people with chronic infections. 3  Human papilloma viruses have been linked to cervical cancer. 4  Human herpes virus-8 has been linked to the development of Kaposi sarcoma.