What condition does PRRS primarily lead to in pigs?

Porcine Reproductive and Respiratory Syndrome (PRRS) is a viral disease that predominantly affects pigs and is known for causing significant respiratory issues, particularly in young pigs. The primary condition that PRRS leads to is pneumonia, which is characterized by inflammation of the lungs and respiratory tract. Infected pigs may exhibit symptoms such as coughing, labored breathing, and lethargy, which are direct consequences of severe lung inflammation and the body's response to fighting the virus.

The pneumonia associated with PRRS can be severe enough to lead to substantial economic losses in the swine industry, making it crucial for producers to implement effective management and biosecurity practices to control the spread of the disease.