Since chikungunya virus (CHIKV) was introduced into the Americas in 2013, its geographic distribution has rapidly expanded. Of 119 serum samples collected in 2014 from febrile patients in southern Mexico, 79% were positive for CHIKV or IgM against CHIKV. Sequencing results confirmed CHIKV strains closely related to Caribbean isolates.
Ahead of Print -Chikungunya Virus as Cause of Febrile Illness Outbreak, Chiapas, Mexico, 2014 - Volume 21, Number 11—November 2015 - Emerging Infectious Disease journal - CDC
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