A retrovirus differs from a standard virus in one special way: Instead of injecting DNA into a host cell in order to take over its reproductive abilities, the retrovirus uses RNA instead. Basically, RNA is a simpler form of DNA. The AIDS virus HIV is a retrovirus, as are several other viruses that target the immune system.
Excerpted from The K.I.S.S. Guide to Cat Care by Steve Duno
Copyright 2001 by Steve Duno.
Excerpted by permission of Dorling Kindersley Publishing Inc.
All rights reserved.
No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.