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A Computer Virus: Only 31 when he died, Franz Schubert (1797-1825) was a prodigious composer; his 10 symphonies (including the 'Unfinished'), piano music and 600 lieder combined Romantic expression with pure melody.
Robert Schumann (1810-56), German Romantic composer, brought the ability to convey mood and emotion to new heights. His compositions include four symphonies, piano music, sonatas and Song cycles.
A computer virus is a portion of computer code designed to insert itsell into an existing computer program, alter or destroy data and copy itself into other programs in the same computer or into programs in other computers.
The main breakthrough in computing came in 1946 when J. Mauchly and P. Eckert (US) built the.high-speed electronic digital computer known as the ENIAC (Electronic Numerical Integrator and Computer).
During the course of adaptation to rabbits the virus has increased in virulence for the new host and at the same time lost virulence for the dog and for man. Such fully adapted virus is known as fixed virus. The rabies vaccine of Pasteur consisted of an emulsion of spinal cord of rabbits infected with fixed virus. Later the rabies virus was also adapted to the chick embryo, but living vaccines prepared in this manner are still in an experimental stage. Other rabies vaccines in use consist of killed virus, infected spinal cord treated with carbolic acid (Semple vaccine) or ultraviolet light to inactivate the virus.
It has long been suspected that infectious mononucleosis, predominantly a disease of young adults, is caused by a virus; but attempts to isolate the virus have been unsuccessful. Recent evidence, however, indicated strongly that the agent responsible is the virus of Burkitt's lymphoma, a virus that is associated with a rare tumor of man in certain regions of Africa. It now appears that a high proportion of adults in other parts of the world have developed antibodies to the virus, indicating previous infection with this or a closely related virus; a number of patients with infectious mononucleosis exhibited an acute rise in the level of these antibodies in the course of the infection.
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