Table 1.

Summary of ML Classification Approaches used in Health Surveillance Systems based on Social Media.

Health Topic	ML Approach*	Social Media Data Source	Article Citation	Year
Chickenpox	DNN, RNN	Internet Search Query	[51]	2018
Measles	CNN, RNN, SVM, k-NN, NB, RF	Twitter	[50]	2018
Mosquito-borne diseases (Dengue, Zika, Chikungunya)	SVM, NB	Twitter	[24]	2018
Dengue	SVM, k-means	Twitter	[35]	2018
Personal-Health Experience	SVM, LR, k- NN, DT, DNN	Twitter	[23]	2017
MERS, Ebola	SVM,NB.LR	Twitter	[37]	2017
Personal-Health Experience	k- NN, DT, LR, SVM, DNN	Twitter	[33]	2017
Mosquito-borne diseases (Dengue, Malaria, Chikungunya)	SVM, NB	Twitter	[28]	2017
Flu	NB	Twitter	[13]	2017
Dengue, Typhoid	SVM	Twitter	[29]	2017
Influenza	ME	Twitter	[46]	2016
Dengue	SVM,NB,ME	Twitter	[40]	2016
Flu	SVM	Twitter	[38]	2016
Asthma	SVM, LR	Twitter	[32]	2016
Allergy	SVM, NB, NBM, k- NN	Twitter	[20]	2016
Influenza	SVM	Twitter	[34]	2016
Health-Related	SVM NB	Twitter	[39]	2016
Flu/Influenza, H1N1	LR	Twitter	[44]	2016
Influenza-A (H1N1)	NB, SVM,RF, DT	Twitter	[25]	2015
Allergy	NBM, NB, RF, SVM	Twitter	[21]	2015
Asthma	Artificial Neural Network (ANN)	Twitter	[101]	2015
ILI	SVM	Twitter	[73]	2014
Flu	k-means, k-NN, SVM	Sina Microblog	[30]	2014
Influenza	SVM	Twitter	[72]	2013
Personal health	NB, NBM, SVM	Twitter	[36]	2013
Health Related	SVM,NB,NBM,RF	Twitter	[31]	2013

*Abbreviations are defined in the body of the paper