Virusis anultramicroscopic infectiousagentmainlycomposed of nucleic acidandwrappedby a protein coat.Theyreplicateandgrowonlywithin thelivinghostcell mainly bacteria, plantsandanimals.The wordviruscomes fromLatinmeanspoison. Mainmodernmeaning ofvirusis "any agentthat causeinfectious disease" firstrecordedin 1728. A virus invades livingcellsandusestheirchemicalmachineryto help keepitselfalivein order toreplicateitself. Viruscauses anumber ofdiseasesthat mayleadsevereconditionofanimalsorplants. "Common cold"iscaused by aspecificviruscalled rhinoviruses, AIDScaused by HIV and manyspecific RNA andDNAviruscausedspecificdiseases. Manyvirusesarespeciesspecific.
Virus is an ultramicroscopic infectious agent mainly composed of nucleic acid and wrapped by a protein coat.They replicate and grow only within the living host cell mainly bacteria, plants and animals.The word virus comes from Latin means poison. Main modern meaning of virus is "any agent that cause infectious disease" first recorded in 1728. A virus invades living cells and uses their chemical machinery to help keep itself alive in order to replicate itself. Virus causes a number of diseases that may lead severe condition of animals or plants. "Common cold" is caused by a specific virus called rhinoviruses, AIDS caused by HIV and many specific RNA and DNA virus caused specific diseases. Many viruses are species specific.
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