We conclude that only large postchiasmal lesions are likely to cause symptomatic homonymous field defects in MS, usually characterized by rapid recovery. Hemifield VEPs have a low sensitivity for the detection of postchiasmal as compared with prechiasmal abnormalities.
Alternate Titles: Bacille Calmette-GuÃ©rin vaccine, Bacillus Calmette-GuÃ©rin vaccine. BCG vaccine, vaccine against tuberculosis. The BCG vaccine is prepared from a weakened strain of Mycobacterium bovis, a bacteria closely related to M. tuberculosis, which causes the disease.
A vaccineâalso called a âshotâ or âimmunizationââis a substance that teaches your body's immune system to recognize and defend against harmful viruses or bacteria before you get infected.These are called âpreventive vaccinesâ or âprophylactic vaccines,â and you get them while you are healthy.reventive vaccines are widely used to prevent diseases like polio, chicken pox, measles, mumps, rubella, influenza (flu), and hepatitis A and B.