A disease caused by PRRS virus shows with reproductive disorders and respiratory symptoms. Sow in late pregnancy (107-113 days of pregnancy) to miscarriage or preterm delivery, stillbirth fetus and cause pneumonia in piglet, grower and the boars causes an abnormal semen.
 
1. Agent
  PRRS virus ;  PRRS virus to facilitate secondary pathogen infection by destroying phagocytic cells of the pig lung.
 
2. Epidemiology
  The first occurrence is reported in the United States in 1987 after the current worldwide distribution
 
3. Clinical Signs
  . Reproductive disorders : fever, loss of appetite, preterm and stillbirth in late pregnancy, milk stop, repeated miscarriage, delayed return of estrus, such as a boar semen abnormality represents.


. Respiratory Symptoms: appear in all age and particularly when concentrated in suckling piglets and weaner. Rapid breathing, eyelid edema, conjunctivitis, elevated body temperature, blue spots at ear, abdomen, inguinal part, in the case of chronic pneumonia represents a lapse into a secondary bacterial and viral infections then symptoms are more become severe.
 
4. Prevention
1) Prevention
  If you examine the infection on the farm through serology test, etc. are not infected is not purchased from an infection when you purchase a pig from the outside to prevent intrusion farm and control the entry of outside vehicles and people, and infected boars are culled to or mating do not use.

2) Vaccination
Mass vaccination before mating and piglet around weaning