Porcine reproductive and respiratory syndrome virus is a major threat to pig production worldwide. The virus is constantly changing, with new variants appearing every year. Some of these new variants can spread more easily or have a greater impact on your herd’s health and productivity. An example is the emergence of a new PRRSV variant named 1C.5 (previously referred to as L1C 1-4-4, or 1-4-4) in late 2020. In the past, monitoring systems have had a difficulty identifying new variants like this quickly enough to allow for a rapid response, and they often focused on describing epidemics that had already happened.
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