Viral Diseases and Immunity

There are only two types of viruses that have been proved to be responsible for tumors in humans. They are Tcell lymphoma/ leukaemia virus(HTLV) and papillomavirus.

HPV infection is limited to the basal cells of stratified epithelium, the only tissue in which they replicate. HPV cannot bind to live tissue; it infects epithelial tissues through micro-abrasions or other epithelial trauma that exposes segments of the basement membrane.

Like all papillomma viruses, HPV produces infections only in keratinocytes of skin or mucous membrane. HPV infection is limited to the basal cells of stratified epithelium, the only tissue in which they replicate. HPV cannot bind to live tissues; it infects epithelial tissues through micro-abrasions or other epithelial trauma that exposes segments of the basement membrane.

This is the correct answer as AIDS is caused by the Human Immunodeficiency Virus. Influenza is caused by Influenzavirus A. The dengue virus (DENV) is the cause of dengue fever.

This is the correct answer as AIDS is caused by either of the three. It can be caused by sexual intercourse, blood transfusion or can be passed on by an AIDS-affected mother to her unborn child.

A diagnosis test called Widal test is used to diagnose typhoid.

Helper-T cells are the replication sites of HIV.

Cold sores, Leukemia, Shingles: All are latent viral infections.

Orthopoxviruses are very large, complex, brick-shaped viruses.

Lentivirus is a member of Retroviridae family.

Hepatitis D virus is an example of negative sense single-stranded RNA virus.

Among the RNA viruses, only the oncoviruses in the family Retroviridae cause cancer.

Epstein-Barr virus is associated with Burkitt's lymphoma and with naso-pharyngeal carcinoma.

This is the correct answer as HIV can be transmitted sexually.