Seroprevalence of Dengue and Chikungunya antibodies among blood donors in Dar es Salaam and Zanzibar, Tanzania: a cross-sectional study

Table 1 Seroprevalence of Dengue and Chikungunya with dual infection in Zanzibar (N = 180) and Dar-es-salaam (N = 101)

Test	Location	Positive n (%)	Confidence intervals	P-value
Dengue IgG	Zanzibar	68 (37.8)	31.0–45.0	0.342
	Dar-es-salaam	44 (43.5)	34.0–53.0	0.342
Chikungunya IgG	Zanzibar	22 (12.2)	7.0–17	0.047*
	Dar-es-salaam	21 (21.2)	13–29	0.047*
Dengue IgM	Zanzibar	0 (0)	NA	NA
	Dar-es-salaam	1 (0.9)	− 1.0–3.0	NA
Chikungunya IgM	Zanzibar	0 (0)	NA	NA
	Dar-es-salaam	3 (2.97)	− 1.0–3.0	NA
Dual infection IgG	Zanzibar	11 (6.1)	3.0–10	0.052
	Dar-es-salaam	13 12.9)	6.0–20	0.052

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