Systematic Veterinary Virology

SYMPTOMS

• The first clinical signs are fever (40.5-41.5^ºC), puffy eyes, anorexia leading to loss of weight, depression, prostration and huddling leading to weakness. These signs are followed by sudden onset of acute respiratory signs, which include paroxysmal coughing, sneezing, irregular abdominal breathing and ocular and nasal discharges.
• Most pigs recover about six days after the onset of the disease. The mortality rate is generally about 1%, but may be higher in young piglets. SIV can precipitate outbreak of more serious respiratory disease causing mortality.
• One of the important problem associated with SIV infection is the high rectal temperature, which in breeding stock result in abortions, infertility, production of small weak litters and increased stillbirths.