Table 4.

Potential risk factors of dengue virus infection in Africa (n = 21 studies).

Factor	No. Studies	Risk Category	Rank	Reference
Increasing old age	6	Socio-demographic	1	[21,48,54,67,68,69]
Lack of mosquito control	6	Environmental	1	[27,45,67,70,71,72]
Urban residence	4	Socio-demographic	2	[28,54,69,73]
Climate change	3	Ecological	3	[19,29,74]
History of recent travel	3	Environmental	3	[27,48,75]
Occupation type	2	Socio-demographic	4	[68,76]
Lack of education	2	Socio-demographic	4	[68,77]
Low income	1	Socio-demographic	5	[54]
Known diabetes mellitus	1	Health	5	[78]