Fig 1.
Patients with chikungunya virus test results identified—Veterans Health Administration, 2014.
One excluded patient with an apparent false-positive CHIKV IgM/IgG result 4 days after symptom onset had no travel to an area with CHIKV transmission; repeat testing was negative. CHIKV, chikungunya virus; reverse transcriptase PCR (RT-PCR).
Fig 2.
Patients with chikungunya virus test results and patients with specimens submitted for chikungunya virus testing without results—Veterans Affairs Caribbean Healthcare System, 2014 (n = 803).
VA PHRL began testing all specimens submitted for chikungunya virus testing from VA Caribbean Healthcare System on December 11, 2014, including specimens for 13 patients prospectively collected during December and unprocessed specimens recovered for 74 patients collected during June–November. Reverse transcriptase PCR results are reported by VA PHRL ≤1 day and serology ≤3 days from specimen receipt.
Table 1.
Demographics and Clinical Characteristics of Patients with Laboratory-Confirmed Chikungunya Virus Infection—Veterans Health Administration, 2014 (n = 180).
Table 2.
Symptoms and Signs of Patients with Laboratory-Confirmed Chikungunya Virus Infection Compared with Chikungunya Virus-Negative Patients—Veterans Health Administration, 2014.
Table 3.
Abnormal Laboratory Findings for Patients with Laboratory-Confirmed Chikungunya Virus Infection (n = 180), Compared with Chikungunya Virus-Negative Patients (n = 72)—Veterans Health Administration, 2014.
Table 4.
Risk Factors Associated with Hospitalization Among Patients with Laboratory-Confirmed Chikungunya Virus Infection—Veterans Affairs Caribbean Healthcare System, 2014.
Table 5.
Laboratory-Confirmed Chikungunya-Associated Fatal Cases—Veterans Affairs Caribbean Healthcare System, 2014.
Fig 3.
Phylogenetic tree comparing sequences of chikungunya virus strains from Puerto Rico with strains from other regions.
Sequences (700 bp) from the E1 envelope glycoprotein gene were aligned and compared in a neighbor-joining tree with a Jukes-Cantor model and 1000 bootstrapping replicates. The resulting tree, with GenBank accession numbers, was displayed by using FigTree v1.2 (http://tree.bio.ed.ac.uk/software/figtree/). The scale bar indicates the distance corresponding with 0.01 nucleotide substitutions per site.