The epidemic lasted until late October when lower temperatures drove off the A. Aegypti mosquitoes, the primary carrier of yellow fever, away or into hibernation. It was not until November 19 when the epidemic was officially declared to be over. Ellis states that "according to estimates, there were around 120,000 cases of yellow fever and approximately 20,000 deaths." The Lower Mississippi Valley also experienced roughly $30 million in economic losses due to the disruption of commerce caused by the epidemic.
