Pig International - July/August 2017 - 20
20 ❙ PigInternational
Understanding pseudorabies in
pigs leads to prevention
Pseudorabies, or PRV, is endemic in most of the world, but it can be
eliminated by current technology, restrictions on PRV-positive breeding
animals and producer awareness.
BY E. WAYNE JOHNSON
Pseudorabies (PRV, Aujeszky's disease) is a severe,
infectious herpes virus disease affecting swine of all
ages. Humans are resistant, but cats, dogs, sheep, cattle,
horses, monkeys, rats and raccoons are susceptible. The
acute epizootic form of the PRV primarily occurs in
näive pig herds without previous exposure or immunity.
Signs of the acute form are abortion, stillbirths,
mummifications and infertility in sows; diarrhea, high
fever and central nervous system CNS signs (tremors
and convulsions) in piglets; and coughing and sneezing in older swine. The death rate in suckling pigs
can approach 100 percent, but is typically less than 10
percent in weaned pigs and low (less than 2 percent) in
older pigs (if no complications). Some high virulence
strains can cause sow mortality, and in growingfinishing pigs, mortality with CNS signs and severe
pneumonia, while some low virulence strains may not
cause any noticeable disease whatsoever.
Dusan Petkovic | istockphoto.com
PREVENTION IS ALWAYS MORE
profitable than treatment, especially
for diseases that are difficult to treat.
www.WATTAgNet.com ❙ July/August 2017