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A collection of citrus tristeza virus (CTV) isolates from different citrus-growing regions of the world was started in 1984 in a quarantine facility at Beltsville, MD. Isolates with diverse biological properties have been received through cooperation with scientists in and Venezuela. To date, 175 CTV isolates have been established and are being maintained. Symptom expression on five different indicator plants has been evaluated or is under evaluation for 114 isolates. Transmission of 28doi:10.5070/c55cf6b4kv fatcat:lymkf473jbeo5fwhex4y6t5rka