Since the beginning of 2018 and as of 14 May, 2 980 autochthonous cases of dengue have been reported in Réunion. The main areas affected are in the western part of the island. The most prevalent serotype among dengue cases is DENV-2 and the main vector implicated in the outbreak is Aedes albopictus.

Since the publication of the joint ECDC-EFSA rapid outbreak assessment on a multi-country outbreak of Listeria monocytogenes serogroup IVb, multi-locus sequence type 6 (ST 6) on 22 March 2018, three EU Member States have reported nine new confirmed outbreak cases.

Since the last epidemiological update on this multi-country hepatitis A outbreak published on 22 December 2017, 22 EU/EEA countries (Austria, Belgium, Croatia, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Luxembourg, Malta, the Netherlands, Norway, Portugal, Slovenia, Spain, Sweden and the United Kingdom-England) have reported 320 new outbreak-confirmed cases. The outbreak-confirmed cases are EU/EEA residents with laboratory-confirmed hepatitis A virus (HAV) genotype IA and a sequence with ≥99.3% homology to one of the three HAV genotype IA outbreak strains (VRD_521_2016; RIVM-HAV16-090; and V16-25801) based on overlapping fragments at the VP1-2a region.

Since the publication of the rapid risk assessment on a multi-country outbreak of Listeria monocytogenes serogroup IVb, multi-locus sequence type 6 (MLST 6) on 6 December 2017, four EU Member States reported seven new confirmed outbreak cases. Two of these cases were fatal.

During the 2017 transmission season, 204 human cases and 127 equine cases were reported in the European Union. This year, for the first time, ECDC included equine West Nile fever cases in its epidemiological updates.

On 6 December 2017, France reported an outbreak of Salmonella Agona in infants <1 years of age linked to consumption of infant milk formula based on an epidemiological investigation. Different brands of infant formulas from the same producer in France and distributed to different countries inside and outside the EU were implicated as the vehicle of infection in this outbreak.

Since the last epidemiological update on this multi-country hepatitis A outbreak published on 29 September 2017, 22 EU/EEA countries (Austria, Belgium, Croatia, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Luxembourg, Malta, the Netherlands, Norway, Portugal, Slovenia, Spain, Sweden and the United Kingdom-England & Wales) have reported 950 new outbreak-confirmed cases. Outbreak-confirmed cases are EU/EEA residents with laboratory-confirmed hepatitis A virus (HAV) genotype IA and a sequence with ≥99.3% homology to one of the three HAV genotype IA outbreak strains (VRD_521_2016; RIVM-HAV16-090; and V16-25801) based on overlapping fragments at the VP1-2a region.

From July to October 2017 the Brazilian authorities reported three confirmed human cases of yellow fever - one in Rio de Janeiro and two in São Paulo State. One person died. In addition, several animal cases were detected in the urban area of São Paulo City. The national health authorities have started a vaccination campaign in São Paulo State.

Since 23 August 2017 there is an ongoing epidemic of plague in Madagascar. As of 20 October 2017 WHO has reported 1 365 cases and 106 deaths leading to 8 % case fatality. Nine hundred and fifteen (67%) cases are pneumonic plague cases. The high proportion of pneumonic plague among cases is of concern, indicating that droplet transmission is a driver of the spread of plague in Madagascar beyond the areas that have been considered as endemic for bubonic plague to date. In the last weeks, the number of new confirmed cases seem to be plateauing, indicating that the outbreak is gradually being controlled.

Since the previous ECDC epidemiological update was published on 30 June 2017, seven EU/EEA countries (Belgium, France, Luxembourg, the Netherlands, Norway, Sweden and the United Kingdom) have reported 96 confirmed and 34 probable new cases associated with the multi-country outbreak of Salmonella Enteritidis with MLVA profiles 2-9-7-3-2 or 2-9-6-3-2 ongoing in the EU/EEA.