Currently, porcine reproductive and respiratory syndrome, more commonly known as PRRS, its acronym, represents one of the major headaches of the pig farms in the country. An outbreak of PRRS causes reproductive problems in sows, such as abortions in the last third of gestation, preterm delivery and birth of weak piglets, many of which die before they are weaned. In the transition piglets and fattening pigs  PRRS is manifested by respiratory signs, growth retardation and increased mortality. As a result, the economic losses are very high, ii is indeed one of the most costly diseases for intensive pig production systems.