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Volume 27, Number 6—June 2021

Rocky Mountain Spotted Fever in a Large Metropolitan Center, Mexico–United States Border, 2009–2019

Oscar E. ZazuetaComments to Author , Paige A. Armstrong, Adriana Márquez-Elguea, Néstor Saúl Hernández Milán, Amy E. Peterson, Diego F. Ovalle-Marroquín, Maria Fierro, Rodolfo Arroyo-Machado, Moises Rodriguez-Lomeli, Guillermo Trejo-Dozal, and Christopher D. Paddock
Author affiliations: Secretariat of Health of Baja California (Instituto de Servicios de Salud Pública del Estado de Baja California), Mexicali, Mexico (O.E. Zazueta, A. Márquez-Elguea, N.S.H. Milán, D.F. Ovalle-Marroquín, R. Arroyo-Machado, M. Rodriguez-Lomeli, G. Trejo-Dozal); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (P.A. Armstrong, A.E. Peterson, C.D. Paddock); Imperial Country Public Health Department, El Centro, California, USA (M. Fierro)

Main Article

Table 1

Frequency of laboratory-confirmed cases of Rocky Mountain spotted fever by assay, Mexicali, Mexico, 2009–2019*

Period No. (%)
Total no. cases
PCR-positive IFA-positive PCR- and IFA-positive
2009–2011 73 (20.74) 275 (78.13) 4 (1.14) 352
2012–2015 172 (56.95) 114 (37.75) 16 (5.30) 302
96 (76.80)
29 (23.20)
0 (0)
Total 341 (43.77) 418 (53.66) 20 (2.57) 779

*IFA, indirect immunofluorescence antibody assay.

Main Article

Page created: April 15, 2021
Page updated: May 20, 2021
Page reviewed: May 20, 2021
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