Invasive ‘ankle biter’ mosquito makes return to Concord over two years since last sighting

An invasive, non-native mosquito known to carry diseases and not seen in Contra Costa County in two years has been found in North Concord.

The Contra Costa Mosquito and Vector Control District said it recently found an Aedes aegypti mosquito in a trap, the first since the district found some in Martinez two years ago.