However, the annual detection rates of NADC30-like strains between 2017 and 2021 were 5.88% (1/15), 22.09% (19/86), 18.18% (2/11), 12.42% (38/306), and 10.17% (6/59), respectively, showing a decreasing trend ( Figure 3 ).
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Epidemiological and Genetic Characteristics of Porcine Reproductive and Respiratory Syndrome Virus in South China Between 2017 and 2021.
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The sentences
The annual detection rates of MLV-derived strains between 2017 and 2021 were 52.94% (9/17), 65.12% (56/86), 81.82% (9/11), 84.97% (260/306), and 79.66% (47/59), respectively, showing an increasing trend ( Figure 3 ).