A slight increase in the incidence of vector-borne diseases was also observed in 2017, mainly due to the dengue virus and chikungunya virus infections; in contrast, malaria displayed a decreasing trend throughout the surveillance years.
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The sentences
When the five disease types were separately analysed, all their incidence rates showed an increasing trend from 2014 to 18, particularly with a sharp increase for respiratory illnesses in 2017 ( Figure 3A ).