This DNA can be integrated into the host cell's chromosome. This virus exhibits antigenic shift - sudden changes in properties that id. F. Viruses and Cancer 1. Some researchers believe even normal retroviruses might cause tumors - merely inserting a normal provirus into the host chromosome near a normal gene might alter its expression and convert it to an oncogene. A teratogen is a drug or other agent that induces such defects.
Viruses are teratogens that can be transmitted across the placenta and infect the fetus.
Affect the central nervous system. Not known exactly how it causes disease. Return to Chp.