Germany swelters as mosquito numbers soar

Germany is currently facing an explosion in mosquito populations, with the humid and warm weather creating perfect breeding grounds. Both native house mosquitoes and the invasive Asian tiger mosquito are flourishing. The Asian tiger mosquito, adaptable to even small amounts of standing water, is spreading rapidly, even in urban areas. This species, originating from tropical regions, is a particular concern as it can transmit diseases such as dengue and chikungunya, though no local transmission chains have been confirmed in Germany yet. The West Nile virus, transmitted by native mosquitoes, is also circulating in parts of the country, having become permanently established in Berlin as of 2026. Cases were recorded across Germany in recent years, with experts believing actual numbers to be higher due to asymptomatic infections. Mosquito populations are expected to reach their peak by late August, resulting in more frequent bites. Extreme dryness, conversely, can limit their numbers by reducing available breeding water. The Asian tiger mosquito, identifiable by its distinctive black-and-white markings and a white stripe from head to wings, has been primarily found in southwest Germany and is expected to spread further north. Residents in some municipalities can report sightings through official online portals to aid control measures. Beyond human health, both mosquito types can transmit roundworm larvae, potentially causing heartworm disease in animals and, rarely, infecting humans.