Figure 6
The relationship between daily newly emerged cases of dengue and the mosquito density in Guangzhou City in 2014.
In this large outbreak of dengue in Guangdong Province, Guangzhou City suffered the most, as it was the major epidemic area. The daily newly emerged cases of dengue reached a peak between September 29 and October 14, exceeding 1000 cases each day and then decreased quickly after October 14, from 1074 cases per day to only 24 cases per week from December 8 to 14. The mean Breteau Index in the different districts of Guangzhou City decreased quickly after September 27, dropped from 28.6 to approximately 5 on November 1 and was stably maintained at 5 or less thereafter. The mosquito density evaluated by the labor hour method showed a similar declining trend. The daily new cases decreased dramatically after October 13, approximately 20 days after the implementation of large-scale mosquito control. The declining trend of daily new cases also showed a 20-day lag in comparison with the mosquito density curve.
