Case Study: Mosquito Eradication Program (Part 11)

Now look carefully at all three graphs for the year 1994 and suggest an explanation.

Three stacked graphs titled Percent of houses covered, Percent of houses infested, and Cases of dengue, double as the y-axes. The x-axis of all 3 graphs is labeled Year and ranges from 1992 to 1995 with 1994 highlighted. The data show a lapse in houses covered the first half of 1994, then increasing to over 75% in the second half of the year. About 6% of houses infested in the first half 1994 dropping to 0 in the second half. Cases of dengue spiked from 0 to 16,450 mid-1994 and then back to 0.
Percentage of houses covered by mosquito interventions vs. percentage of houses infested with mosquitoes vs. cases of dengue in Fortaleza in 1994