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Cumulative cases of dengue per 5-year period: 2001–2005 (2.9 million cases), 2006–2010 (5.2 million cases), and 2011–2015 (8.2 million cases).
In the period 2011–2015, the number of dengue cases in the Americas trended upward—as has been the case over the last 30 years (Figure 2).
In 2015, transmission was documented in 44 countries and territories of the Region, with an average cumulative incidence of 73.28 cases per 100,000 inhabitants.
During 2016 (up to epidemiological week 52), 361,312 cumulative suspected cases (cumulative incidence rate of 51.96 per 100,000 inhabitants) were reported in the Region and 157,288 were confirmed Cases reported by IHR national focal points to PAHO/WHO and/or through Member State websites or official news publications.
In turn, these figures show a 22% drop in the number of severe cases over the previous 5-year period (2006–2010), when 5,194,657 cases of dengue were reported, including 151,437 severe cases and 2,599 deaths.
Dengue epidemics occur cyclically every 3 to 5 years in the Region, with each epidemic surpassing the number of cases in the previous one.
b Suspected case: patient with acute onset of fever 38°C (101°F) and severe arthralgia or arthritis not explained by other medical conditions, and who resides or has visited epidemic or endemic areas within two weeks prior to the onset of the symptoms.
Confirmed case: a suspected case with any specific chikungunya test (viral isolation, RT-PCR, Ig M, or four-fold increase of chikungunya specific antibodies titers) – PAHO/CDC confirmed case definition available at org/chikungunya.
Since 2010, PAHO, together with regional partners and WHO Collaborating Centers, has helped the countries to prepare for the possible introduction of chikungunya in the Region.
Thanks to this continuous technical support, it has been possible to strengthen the diagnostic capacity and clinical management of the disease.