RNA viruses were used sometimes as delivery systems in genetic engineering.

This is the single largest group of RNA viruses with 30 families.

Classification of the RNA viruses has proven to be a difficult problem.

A small number of positive stranded RNA viruses have been described.

RNA viruses can be placed into four different groups depending on their modes of replication.

His research is focused on the gene expression of RNA viruses.

Five families of RNA viruses have been recognised as being able to cause this syndrome.

Currently there are 5 orders and 47 families of RNA viruses recognised.

It is a double stranded RNA virus with no specific assigned family.

As an RNA virus, it must enter the cell to replicate.

Background RNA viruses are important pathogens in humans, animals, and plants.

This is a family of enveloped negative single stranded RNA viruses.

In the case of RNA viruses, these get destroyed immediately by the mechanism cited above.

It may have some activity against RNA viruses.

Cilevirus is a genus of single positive stranded RNA virus.

RNA viruses which replicate close to the error threshold have a genome size of order 10 base pairs.

This is similar to other RNA viruses.

For this reason, these viruses are called positive-sense RNA viruses.

These are not currently classified as RNA viruses and are described on their own pages.

This group of RNA viruses includes the rabies virus traditionally associated with the disease.

Evolvability of an RNA virus is determined by its mutational neighbourhood.

You're quite right, I failed to mention that rabies is an RNA virus.

The influenza virus is an RNA virus containing eight genes.

The RNA viruses are especially prone to mutations.

Such hypermutation can be lethal to RNA viruses.