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Recently the number of reported cases has continued to increase.
Before 1970, only 9 countries had experienced severe dengue epidemics.
The disease is now endemic in more than 100 countries in the WHO regions of Africa, the Americas, the Eastern Mediterranean, South-East Asia and the Western Pacific.
The Western Pacific Region reported more than 375 000 suspected cases of dengue in 2016, of which the Philippines reported 176 411 and Malaysia 100 028 cases, representing a similar burden to the previous year for both countries.
The Solomon Islands declared an outbreak with more than 7000 suspected.
One estimate indicates 390 million dengue infections per year (95% credible interval 284–528 million), of which 96 million (67–136 million) manifest clinically (with any severity of disease).
Member States in three WHO regions regularly report the annual number of cases.The number of cases reported increased from 2.2 million in 2010 to over 3.34 million in 2016.Although the full global burden of the disease is uncertain, the initiation of activities to record all dengue cases partly explains the sharp increase in the number of cases reported in recent years.The incidence of dengue has grown dramatically around the world in recent decades.A vast majority of cases are asymptomatic and hence the actual numbers of dengue cases are underreported and many cases are misclassified.Similarly, a 53% reduction in severe dengue cases was also recorded during 2017.The post Zika outbreak period (after 2016) has seen a decline of cases of dengue and the exact factors leading to this fall decrease is still unknown.Not only is the number of cases increasing as the disease spreads to new areas, but explosive outbreaks are occurring.The threat of a possible outbreak of dengue fever now exists in Europe as local transmission was reported for the first time in France and Croatia in 2010 and imported cases were detected in 3 other European countries.In 2012, an outbreak of dengue on the Madeira islands of Portugal resulted in over 2 000 cases and imported cases were detected in mainland Portugal and 10 other countries in Europe.Among travellers returning from low- and middle-income countries, dengue is the second most diagnosed cause of fever after malaria.