Skip to main content
. 2003 Jun;41(6):2433–2439. doi: 10.1128/JCM.41.6.2433-2439.2003

FIG. 2.

FIG. 2.

Phylogenetic tree based on the ORF5 region of PRRSV isolates analyzed in the study: two MLV vaccines (Ingelvac PRRS MLV and Ingelvac PRRS ATP, designated with a *) used as the HMA references, 51 PRRSV field isolates analyzed in the study, including the parent strains of the two vaccines, VR2332 and JA142, and the European Lelystad virus (LV) as the outgroup. Homoduplex-forming isolates are shown in boldface. The tree was constructed with the PAUP program with a heuristic search option with midpoint rooting and 1,000 replicates.