Which step of the "chain of infection" is disrupted by eliminating the standing water in old tires, birdbaths, and empty buckets when combating the zika virus epidemic?

The step of the "chain of infection" that is disrupted  by eliminating the standing water in old tires, birdbaths; and empty buckets when combating the zika virus epidemic is eliminating the reservoir. Zika virus cause the zika infection that is spread mostly through bites of an infected Aedes species mosquito. These mosquitos bite during the day and night. The virus can be passed from a pregnant woman to her fetus, and can cause certain birth defects.