Local spread of mosquito-borne diseases continue to accelerate in parts of Europe, with France this week reporting 82 more chikungunya cases, raising its total to 383, along with 2 more dengue cases, bringing that total to 21, the European Centres for Disease Prevention and Control (ECDC) said today in its weekly communicable disease update. Italy reported 60 more locally acquired chikungunya cases, raising its total to 167, but officials noted no new local dengue cases. In another development, two probable local Plasmodium falciparum malaria cases were confirmed in Greece, along with another with an undetermined place and mode of infection. The probable local cases involve two migrants and are epidemiologically linked. Their suspected infection location is a rural village in central Greece. The other case involves a migrant from a non-endemic country in North Africa who arrived on a Greek island in June before moving to a migrant facility in Attica. The patient's symptoms began in late July.

Three countries—Chad, Nigeria, and Somalia—reported new polio cases this week, according to the latest weekly update from the Global Polio Eradication Initiative (GPEI). All involve vaccine-derived types. Chad reported 2 circulating vaccine-derived poliovirus type 2 (cVDPV2) cases in patients with late July illness onsets, raising its total for the year to 18. The country also reported a circulating vaccine-derived poliovirus type 3 (cVDPV3) case with a July onset, its second such case of 2025. Nigeria reported 4 cVDPV2 cases, 1 with a May paralysis onset and 3 with onsets in July, pushing its total to 28. Somalia reported one new cVDPV2 case with a June paralysis onset, putting its total at eight.

In the latest H5N1 avian flu developments, more outbreaks in poultry have been confirmed in two states, part of a late-summer uptick in activity, according to the latest notifications from the US Department of Agriculture (USDA) Animal and Plant Health Inspection Service (APHIS). South Dakota has two more outbreaks, one at a turkey farm in Jerauld County and the other at a facility in Spink County. The virus also struck a producer in Liberty County, Montana, that has 5,800 birds. Meanwhile, the Maryland Department of Agriculture announced a presumed positive involving a backyard flock in Anne Arundel County, marking the state's third detection of 2025.