Similar reports had been made for another major viral agent of PRDC, PCV2 [ 32- 34].
The present study also reinforces a the previous suggestion that PRRSV is one of the major viral agent for PRDC [ 30, 31].
Several major pitfalls exist in the identification of viral agents by negative stain electron microscopy.
In conclusion, this mRT-qPCR assay is a sensitive and specific technique capable of detection of three major viral respiratory pathogens of cattle, and may have additional benefit when more than one agent is involved.
Therefore, other viral agents associated with AFP need to be identified, especially nonpolio human enteroviruses (HEVs), which are a major cause of neurologic illness.
In the last two years, Dr. Shope worked on a Defense Department project to develop antidotes to viral agents that terrorists might use.
Sexually transmitted viral agents include the human papillomavirus, which causes genital warts.
However, a causative association between viral agents and VKH disease has not yet been established.
These polymers are in their infancy compared with viral agents, which have been optimised during millions of years of evolution, making viral vectors naturally efficient transfection agents.
