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Number of cases of vector-borne disease U.S. 2018, by disease

In 2018, there were around 23,558 confirmed cases of Lyme disease, making it the most common vector-borne disease in the U.S. Lyme disease is transmitted to humans through ticks. The most common mosquito-borne disease in the U.S. was West Nile virus. This statistic displays the number of cases of notifiable vector-borne diseases in the U.S. in 2018, by disease.

Vector-borne disease

Vector-borne diseases are infectious human illnesses caused by parasites, viruses, or bacteria, and are transmitted through other living organisms called vectors, either between humans or from animal to human. Common vectors include mosquitoes, ticks and various types of flies. Mosquitoes cause the highest number of human deaths annually worldwide, as they transmit diseases such as malaria, West Nile virus, and Dengue. In the United States, the number of vector-borne diseases has been increasing over time.

Lyme disease

Of all tick-borne disease reported in the U.S., the highest numbers come from the Northeast, with Lyme disease as the most reported disease type. After a bite from an infected tick, if left untreated, the infection can spread through different body systems, causing a variety of potentially debilitating and chronic symptoms. When signs of the disease are recognized early on, antibiotics can combat the spread of the infection to complete recovery.

Number of cases of notifiable vector-borne diseases in the U.S. in 2018, by disease

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Release date

November 2019


United States

Survey time period


Supplementary notes

Includes confirmed cases only.
Release date represents the date figures were accessed.

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Statistics on "Lyme disease in the U.S."

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