Phylogenetic relationships among 8 strains of Catarina virus (CTNV) isolated from southern plains woodrats (Neotoma micropus) captured on the Chaparral Wildlife Management Area (CWMA), based on a neighbor-joining analysis of nucleocapsid protein gene sequence data. BCNV, Bear Canyon virus strain AV A0070039; TAMV, Tamiami virus strain W 10777; WWAV, Whitewater Arroyo virus strain AV 9310135. Branch lengths are proportional to genetic (p) distances; the numbers at the nodes indicate the percentage of 1000 bootstrap replicates that supported the interior branches; bootstrap support values less than 70% are not listed; and BCNV was the designated outgroup. The branch labels for the CTNV strains include (in the following order) virus strain, woodrat (TK) number, and month and year in which the virus-positive sample was collected.