St. Louis encephalitis virus infection was detected in summer 2015 in southern California after a 12-year absence, concomitant with an Arizona outbreak. Sequence comparisons showed close identity of California and Arizona isolates and a relationship with 2005 Argentine isolates, suggesting virus introduction from South America and underscoring the value of continued arbovirus surveillance.
Ahead of Print -Reemergence of St. Louis Encephalitis Virus, California, 2015 - Volume 22, Number 12—December 2016 - Emerging Infectious Disease journal - CDC
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