It is a RNS - virus, its incubation is about 40 days. It causes a high mortality between pregnant by first infection. It is very frequent in India and Mexico. Definition of virus Viruses are obligate intracellular parasites, they can only multiply inside living cell. There is no division.
Reproduction occurs by only means of nucleic acid.
There is no growth in the extracellular latent phase. There are no metabolic enzymes Replication by means of the ribosomes of the host cells Groups of viruses Viruses are generally divided into animal viruses, plant viruses and bacterial viruses. The division of viruses in to groups is important as they do not cross the boundaries as they are specialized to the biology of their hosts. Only a few viruses , however can do that. The name of animal viruses are based on the disease caused on the principal host followed by the name virus.