MEDICAL DICTIONARY
Positive-strand RNA virus: Also known as a sense-strand RNA virus, a virus whose genetic information consists of a single strand of RNA that is the positive (or sense) strand which encodes mRNA (messenger RNA) and protein. Replication in positive-strand RNA viruses is via a negative-strand intermediate. Examples of positive-strand RNA viruses include polio virus , Coxsackie virus, and echovirus .
There are two types of RNA viruses. Some are positive in that they have a "sense" strand of RNA (coded information about how to build proteins ) as their genetic material. And other RNA viruses tare negative in that they have an " antisense " strand (the paired opposite of the coded information). Positive-strand or sense-strand RNA viruses are therefore as opposed to negative-strand or antisense-strand RNA viruses.
See also: Negative-strand RNA virus .
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