Department of Vector & Parasite Control, Huangpu Center for Disease Control & Prevention, Shanghai, 200023, People's Republic of China.
Department of Vector & Parasite Control, Shanghai Municipal Center for Disease Control & Prevention, Shanghai, 200336, People's Republic of China.
Parasit Vectors. 2023 Jun 1;16(1):176. doi: 10.1186/s13071-023-05732-1.
Shanghai has numerous high-rise apartment and office buildings, but the effects of these high-rise spaces on the vertical dispersal, oviposition and blood feeding behavior of Aedes albopictus are unknown.
In six multi-story building blocks in downtown Shanghai, 174 mosq-ovitraps (MOT) were placed both indoors and outdoors for Ae. albopictus collection at different vertical heights from the 1st to 6th floors and a terrace on the 8th floor. Collections were made for 4 months. The human landing catch (HLC) method for Ae. albopictus monitoring was also conducted on 6 consecutive days on six floors of two of the six buildings to study the feeding behavior of Ae. albopictus at different heights.
Both MOTs and HLCs collected Ae. albopictus at all monitored heights. The vertical distribution, oviposition pattern and biting behavior varied significantly among the seven heights (1st-6th floors and 8th floor) (mosq-ovitrap index (MOI): X = 140.616, df = 6, P < 0.001; HLC: F = 15.111, P < 0.001). The MOI at low heights (1st + 2nd floors) was significantly higher than that at medium (3rd + 4th floor, P < 0.001) and high heights (5th + 6th floors, P < 0.001), and there was no significant difference in the MOI for the 3rd-6th floors. The outdoor MOIs were significantly higher than indoor MOIs at all heights (outdoor 23.09% vs. indoor 9.58%, X = 74.121, df = 1, P < 0.001). Aedes albopictus HLC density on the ground floor was significantly higher than that on all other heights (5.04 vs. 0.13, 0.29, 0.58, 0.79 and 1.50 per half hour, P < 0.05), while no difference was detected among the heights above the ground floor (P > 0.05).
Aedes albopictus is more common near the ground level, but it can easily disperse to higher floors in the multi-story buildings of urban Shanghai. No significant differences in Ae. albopictus density were detected within the 3rd-6th floors using MOT or HLC. This suggests that Ae. albopictus might also disperse to areas above the 6th floor and seek hosts there. Aedes albopictus prefers to oviposit outdoors; however, Ae. albopictus was also able to inhabit, oviposit and engage in blood-feeding behavior indoors on different floors. The three-dimensional dispersal pattern of Ae. albopictus in urban areas could facilitate arbovirus transmission and increase the difficulty of dengue control.
上海拥有众多高层公寓和办公楼，但高层空间对白纹伊蚊垂直扩散、产卵和吸血行为的影响尚不清楚。
在上海市中心的 6 栋多层建筑中，在 1 楼至 6 楼和 8 楼的露台内外共放置了 174 个诱蚊诱卵器（MOT），以收集不同垂直高度的白纹伊蚊。收集工作进行了 4 个月。还在这 6 栋楼中的 2 栋的 6 层楼连续 6 天进行了人类登革热诱蚊器（HLC）监测，以研究不同高度白纹伊蚊的取食行为。
MOT 和 HLC 均在所有监测高度处收集到白纹伊蚊。7 个高度（1 楼至 6 楼和 8 楼）之间的垂直分布、产卵模式和叮咬行为差异显著（诱蚊诱卵器指数（MOI）：X=140.616，df=6，P<0.001；HLC：F=15.111，P<0.001）。低楼层（1 楼和 2 楼）的 MOI 明显高于中楼层（3 楼和 4 楼，P<0.001）和高楼层（5 楼和 6 楼，P<0.001），而 3 楼至 6 楼的 MOI 没有显著差异。所有高度的室外 MOI 明显高于室内 MOI（室外 23.09%比室内 9.58%，X=74.121，df=1，P<0.001）。底层的白纹伊蚊 HLC 密度明显高于其他所有高度（每半小时 5.04 只比 0.13、0.29、0.58、0.79 和 1.50 只，P<0.05），而高于底层的高度之间没有差异（P>0.05）。
白纹伊蚊更常见于接近地面的位置，但它可以很容易地扩散到上海多层建筑的更高楼层。使用 MOT 或 HLC 时，在 3 楼至 6 楼之间未检测到白纹伊蚊密度的显著差异。这表明白纹伊蚊也可能扩散到 6 楼以上的区域并在那里寻找宿主。白纹伊蚊喜欢在户外产卵，但也可以在不同楼层的室内栖息、产卵和吸血。白纹伊蚊在城市地区的三维扩散模式可能会促进虫媒病毒的传播，并增加登革热控制的难度。
