Sustained transmission of CHIKV was mainly observed in two neighboring villages in Emilia-Romagna region (North-Eastern Italy), namely Castiglione di Cervia and Castiglione di Ravenna [1] , comprising 3,968 inhabitants in a built-up area of about 70 ha. The two villages are separated by a river with relatively stagnant water resulting from the presence of a lock. Houses are typically low (two storeys), surrounded by small gardens with many flowers, plants and flower pots. During the outbreak in the streets, drainage systems were visible, indicating open stagnant water underground [17] .