Analysis on mosquito control effect in quarantine hotels for COVID-19 medical observation in Pudong District in 2020

ABSTRACT

Objective To analyze the mosquito density and larvae breeding of quarantine hotels for COVID-19 medical observation in Pudong District of Shanghai in 2020, assess mosquito control effect in outdoor environment of the hotels, and provide suggestions for the prevention and control of mosquito-borne diseases in these hotels. Methods CO2 traps were used for the investigation of mosquito density outside the quarantine hotels in the middle of every month from May to November in 2020, Breteau index and mosq-ovitrap method were adopted to monitor Aedes albopictus laval density in the middle of every month from May to October. Those investigation were also carried out in residential areas around the quarantine hotels. Mosquito control was conducted once a month in the town where the quarantine hotels located from May to November. Results The peak of mosquito density, Breteau index and mosq-ovitrap index in quarantine hotels for medical observation all appeared in June, being 1.85, 10.49 and 7.99 insects per trap per hour, respectively. The peak of mosquito density, Breteau index and mosq-ovitrap index in residential areas appeared in different month, being 2.00, 9.08 and 12.40 insects per trap per hour, respectively. The peaks of mosquito density and mosq-ovitrap index in quarantine hotels were earlier than those in residential areas. Statistical analysis showed that there was significant difference in the positive rate of mosq-ovitrap between quarantine hotels and residential areas (P < 0.001). The mosquito density in quarantine hotels reached the control standard, but the control effect of Aedes albopictus breeding sites was poor. Conclusion There was a risk of mosquito-borne diseases in quarantine hotels, so attention should be paid to mosquito control in such places and the construction of anti-mosquito facilities.