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Volume 19, Number 1—January 2013

Letter

Seroprevalence of Crimean-Congo Hemorrhagic Fever Virus, Bulgaria

Iva ChristovaComments to Author , Teodora Gladnishka, Evgenia Taseva, Nikolay Kalvatchev, Katerina Tsergouli, and Anna Papa
Author affiliations: Author affiliations: National Center of Infectious and Parasitic Diseases, Sofia, Bulgaria (I. Christova, T. Gladnishka, E. Tasseva, N. Kalvatchev); Aristotle University of Thessaloniki, Thessaloniki, Greece (K. Tsergouli, A. Papa)

Main Article

Table

Univariate and multivariate regression analysis of CCHFV seropositivity in human population, Bulgaria*

Variable No. (%) IgG positive, n = 28 No. (%) IgG negative, n = 990 Univariate analysis
Multivariate analysis
OR (95% CI) p value OR (95% CI) p value
Age, y 1.00 (0.99–1.03) 0.494

Median

46 48

Range

20–83 2–89
Sex 0.456

M

16 (3.1) 495 (96.9) 1.33 (0.62–2.85)

F

12 (2.4) 495 (97.9) Ref
Tick bite <0.001 <0.001

Yes

15 (9.3) 147 (90.7) 6.62 (3.09–14.19) 5.40 (2.47–11.84)

No

13 (1.5) 843 (98.5) Ref
Animal contact 0.253

Yes

11 (3.7) 290 (96.3) 1.56 (0.72–3.38)

No

17 (2.4) 700 (97.6) Ref
Farming 0.001 0.012

Yes

13 (6.7) 182 (93.3) 3.85 (1.80–8.23) 2.76 (1.25–6.08)

No

15 (1.8) 808 (98.2) Ref

*CCHFV, Congo-Crimean hemorrhagic fever; OR, odds ratio; Ref, reference.

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