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Volume 18, Number 5—May 2012

Letter

Serologic Evidence of West Nile Virus Infection among Humans, Morocco

Hicham El RhaffouliComments to Author , Mehdi El Harrak, Chafiqa Lotfi, Fatima El Boukhrissi, Tahar Bajjou, Abdelilah Laraqui, Farida Hilali, Mouna Kenfaoui, and Idriss Lahlou-Amine
Author affiliations: University Mohammed V-Souissi, Rabat, Morocco (H. El Rhaffouli, F. El Boukhrissi, T. Bajou, A. Laraqui, F. Hilali, I. Lahlou-Amine); Laboratoire Bio-Pharma, Rabat (M. El Harrak, C. Lotfi); Military Hospital Moulay Ismail, Meknes, Morocco (F. El Boukhrissi); Laboratoire Maamora, Kenitra, Morocco (M. Kenfaoui)

Main Article

Table

West Nile virus neutralizing antibody titers in human serum samples obtained during March–April 2011, Morocco

Cohort, location* No. samples positive/no. tested (%) Median ± SD Titer (%)
Weak, 18–80 Intermediate, 81–320 High, >320
A, Meknes 7/150 (4.7) 54 ± 42.5 5 (71.4) 1 (14.3) 1 (14.3)
B, Rabat 24/200 (12) 54 ± 31 22 (91.7) 1 (4.2) 1 (4.2)
C, Kenitra 28/149 (18.8) 95 ± 72 19 (67.9) 3 (10.7) 6 (21.4)
Total 59/499 (11.8) 72 ± 41 46 (78) 5 (8.5) 9 (13.5)

*Study participants were divided into 3 cohorts according to the vicinity from which they were recruited.

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