A method of predicting the virulence of a new or uncharacterized PRRS virus strain is provided wherein the strain is injected into swine and allowed to replicate for a period of from about 3-15 days. During this period, the rate of virus growth and/or the magnitude of viremia is determined, and this data is compared with a corresponding growth rate and/or viremia magnitude of a PRRS virus strain of known virulence, as a measure of the virulence of the new or uncharacterized strain.

 
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< Use of Shigella invaplex to transport functional proteins and transcriptionally active nucleic acids across mammalian cell membranes in vitro and in vivo

> Modulators of the glucocorticoid receptor

> Expression elements

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