Dengue worldwide overview

Geographical distribution of dengue cases reported worldwide, July to September 2019 

Dengue cases worldwide 20 September 2019

Europe

On 17 September 2019, local health authorities in Spain reported a laboratory-confirmed autochthonous case of dengue in Barcelona, Spain, in a resident with no reported travel to any endemic country. The Protocol for Surveillance and Control of arboviruses transmitted by mosquitos was activated in Catalonia which includes control measures against tiger mosquitos and mosquito surveillance to prevent further cases. According to Spanish local health authorities, the risk of transmission is very low due to the decreasing temperatures.

On 17 September 2019, local health authorities in Spain reported a laboratory-confirmed autochthonous case of dengue in Barcelona, Spain, in a resident with no reported travel to any endemic country. The Protocol for Surveillance and Control of arboviruses transmitted by mosquitos was activated in Catalonia which includes control measures against tiger mosquitos and mosquito surveillance to prevent further cases. According to Spanish local health authorities, the risk of transmission is very low due to the decreasing temperatures. 

Americas and the Carribean

The Pan American Health Organization (PAHO) has reported 2 409 392 suspected and confirmed dengue cases in the Americas region in 2019 as of 8 September 2019. Brazil is accounting for 81% of the cases (1 960 000 cases), recording a ten-fold increase compared with the same period in 2018 when 203 200 cases were reported. Nicaragua, Brazil, Honduras, Belize and El Salvador had the highest incidence rates in the Region of the Americas.

The four dengue virus serotypes (DENV 1, DENV 2, DENV 3, and DENV 4) are currently circulating simultaneously in the Region of the Americas which increases the risk of severe cases. In 2019, Brazil, Colombia, Guatemala, Honduras, and Nicaragua have declared epidemiological alerts at national level. The figures for each country of the Americas region can be found on the PAHO Health Information Platform.

Asia

This year, most of the countries in Asia and South-East Asia are observing a spike in the number of cases.

In South Asia, the Maldives have officially reported 3 706 cases as of 4 September 2019.

As of 10 September, Thailand has reported 85 520 cases, compared with 37 000 for the same period in 2018. The most affected provinces are Chiang Rai, Rayong, Ubon Ratchathani, and Chanthaburi. 

As of 29 August 2019, Cambodia has reported approximately 38 000 cases of dengue, compared with 6 000 for the same period in 2018. 

As of 29 August 2019, Laos has reported a cumulative number of 24 758 cases. The trend of weekly reported cases is increasing, and dengue activity is significantly higher compared with the same period in 2018 (4 400 cases).

As of 16 September 2019, Malaysia has reported 96 300 cases of dengue in 2019, compared with 53 800 cases for the same period in 2018. 

According to the Ministry of Health and as of 10 September 2019, Nepal has reported 5 095 cases in 2019. This is an increase of 3 500 cases in the past two months.

The Philippines Department of Health (DoH) has reported 208 917 dengue cases and 882 deaths since January and up to 23 August 2019. Last year, for the same period, the country had recorded 103 000 cases. In August 2019 and in response to the National Dengue Epidemic, local health authorities conducted regular community and school clean-up drives and implemented vector control measures such as the installation of ovitraps and insecticide treated screens in public elementary schools, space spraying, and Targeted Outdoor Residual Spraying in dengue hotspot areas.
The DoH has declared a national dengue epidemic.

As of 16 September 2019, Singapore has reported 11 810 cases of dengue, compared with 2 000 cases for the same period in 2018. 

As of 15 September 2019, Taiwan has reported 469 cases, compared with 129 cases for the same period last year. The outbreak is mainly affecting the city of Kaohsiung. The majority of the cases (82%) are imported cases. 

As of 28 July, Vietnam has reported 124 751 cases of dengue, compared with 37 200 cases for the same period in 2018. The number of cases has been sharply increasing since week 15 and is above seasonal levels.

For the countries below, different trends have been observed.

Sri Lanka is following the same trend as in 2018. According to the Ministry of Health and as of 16 September 2019, Sri Lanka has reported 46 126 cases of dengue in 2019, compared with 51 600 cases for the same period last year. Colombo, Gampaha, Kalutara and Matale districts are the most affected areas.

For Bangladesh, Pakistan and Nepal, no specific yearly trend can be observed, due to the absence of solid data for 2018.

Bangladesh report 81 839 cases in 2019, as of 16 September 2019. This is an increase of approximately 30 000 cases in the last month.

According to the national institute of health, Pakistan has reported 3 831 cases of dengue since the beginning of the year and as of 11 September 2019.

There is no update for India.

Africa

From 10 May – 25 August 2019, Benin has reported nine confirmed and 13 suspected cases of dengue fever.

According to WHO, Côte d’Ivoire and Tanzania continue to report cases.

Côte d’Ivoire has reported 302 confirmed and 2 919 suspected cases as of 15 of September 2019. Serotypes 1 and 3 are co-circulating.

From 1 August 2018 – 8 September 2019, Tanzania has detected 6 912 confirmed cases. The most affected regions are Dar es Salaam and Tanga.

Regional authorities in Réunion continue to record a declining trend. Since the beginning of 2019, and as of as of 10 September 2019, the island has reported 17 902 confirmed, 49 800 suspected cases and 19 deaths. The most affected areas are Saint-Pierre and Saint-Leu.

Regional authorities in Mayotte are reporting 101 locally acquired dengue cases, as of 17 September 2019. This represents an increase of 21 cases in the past month.

There is no update for Mauritius.

Australia and the Pacific

As of 27 August, Australia has reported 943 cases of dengue in 2019, which is higher compared with the same period in 2018 (490 cases) but still within seasonal trend.

As of 11 August 2019, French Polynesia has reported 721 cases of dengue since the beginning of the year, affecting the islands of Tahiti, Bora-Bora, Moorea, and Nuku-Hiva.
Both DENV-1 and DENV-2 are circulating.

There is no update for New Caledonia.

All country numbers are retrieved from official sources.