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Background  Despite the expanding worldwide distribution of  Aedes albopictu s and its increasing relevance as arboviral vector, current methods to collect adult specimens are not optimal. Improved approaches are thus needed to monitor their density and pathogen infections, and to establish baseline data for control interventions. A widely used device is the BG-Sentinel (BG-trap) which mostly targets host-seeking females attracted by release of CO 2  and/or a synthetic odour blend (the BG lure). We compared the attractiveness of this blend to that of the Mbita (MB5) lure, a new synthetic blend of proven efficiency in attracting Afrotropical malaria vectors, and evaluated the additional effect of CO 2  to the two odour baits.    Findings  We carried out 6x6 Latin square experiments in two  Ae. albopictus -infested areas in Rome, baiting the BG-traps as follows: CO 2 , BG lure, MB5 lure, BG lure + CO 2 , MB5 lure + CO 2,  no bait. CO 2  was derived from yeast-fermented sugar. Overall, 949 females and 816 males were collected. Baited traps collected significantly more females than unbaited ones. Traps baited with either lures in combination with CO 2  were more effective than those baited with CO 2  alone. No significant differences were observed in female captures between traps baited with any of the two lures, nor between the two lures, independently from the addition of CO 2 . The use of BG lure + CO 2  significantly increased males catches compared to unbaited traps.    Conclusions  The results suggest a broad significance of the MB5 lure for sampling medically important mosquito species and highlight the high efficacy of the combination of lures + CO 2  for female  Ae. albopictus  and of BG lure + CO 2  for males, leading to consider CO 2  as an essential additional cue for the sampling of this species.

parasites and vectors

Field evaluation of a novel synthetic odour blend and of the synergistic role of carbon dioxide for sampling host-seeking Aedes albopictus adults in Rome, Italy