Value of the data •Outbreak raw data is tangible for disease etiology and its emergence in Southeast Asia. •Virulence data are useful for descriptive epidemiology like secular trends, seasonality, epidemic period, geography and person attributes (disease-age and disease-scale) relationships. •The data raises awareness, informs about susceptibility within the community and also informs about phenotypic changes. •This data supports disease model framing in tropical environments. •Data on monthly-annual and geographical trends supports development of public health policies.