Table 1.

Number of documents and its attributes.

Attribute	Category	No. Studies	Percentage
Disease	Dengue	1	2.4
	Ebola	15	35.7
	Generic	1	2.4
	H1N1	11	26.2
	H7N9	1	2.4
	Polio	3	7.1
	SARS	1	2.4
	Zika	9	21.4
Internet sources	Social media (Twitter, Facebook…)	22	52.4
	Forums/blogs/websites	3	7.1
	Mixed Sources	2	4.8
	Online news	3	7.1
	Online survey	8	19.0
	Other (reviews, qualitative data.)	4	9.5
Methods	Qualitative	9	21.4
	Quantitative	28	66.7
	Mixed methods	5	11.9
Data analysis	Content analysis	13	31.0
technique	Survey/scales	13	31.0
	Experimental/computational analysis	15	35.7
	Qualitative synthesis or review	1	2.4
Country	Australia	1	2.4
	Canada	4	9.5
	France	1	2.4
	Germany	1	2.4
	Italy	1	2.4
	Israel	2	4.8
	Netherlands	1	2.4
	Nigeria	1	2.4
	USA	9	21.4
	UK	4	9.5
	Worldwide	17	40.5
Total		42	100.0