- Lyme disease is a tick-borne disease in the northern United States.
- Ticks associated with Lee’s disease are located in the northeast, but there are various diseases in other areas.
- In the southern and central parts of the United States, a specific fever transmitted by various dog mites is more dangerous than Lyme.
The tick season usually begins in early spring and lasts until the fall in most parts of the United States, causing illnesses such as the flu, which can have long-term health consequences.
Depending on where you live, the early signs of a tick infection can vary. The Centers for Disease Control and Prevention estimates that at least nine different types of ticks can spread the disease in the United States.
In all, the CDC reports about 50,000 cases of various tick-borne diseases each year. Some tick-borne diseases are very rare, so only a few cases are reported each year across the country, so Insider has compiled a map of tick-borne diseases.
Lyme disease is the most common tick-borne disease in the United States, but the total number of cases is concentrated in areas where blackflies live.
For the purpose of the map, Insider used various scales to describe the prevalence of Lyme disease and Rocky Mountain fever, another tick-borne disease. In the states, there were 100 or more cases per million people in 2019, with a high incidence of Lyme disease, but the high incidence of specific fevers was 50 cases per million people. Countries with less than 10 cases per million people for each disease are highlighted in gray.
Lyme disease is widespread in the Northeast and Midwest
Cases of Lyme disease are commonly reported in states where Ixodes scapularis is a tick-type host. Also known as the deer mite, this black-legged mite originated in the northeast and spread to the coast and the Midwest with climate change.
Maine, Vermont and New Hampshire reported between 800 and 1,200 cases per million people in 2019, the most recent year with full surveillance data compiled by the CDC.
The largest number – at least 100 cases per million people – was recorded west of Minnesota and on the east coast. When you travel to southern Virginia, where different types of mites grow, the disease decreases.
A clear fever in the Rocky Mountains covers the south, but lower than the Lime
Although less common than Lyme disease, the tick-borne disease known as Rocky Mountain Fever affects thousands of people in the southern United States each year.
According to the CDC, five states – Arkansas, Missouri, North Carolina, Tennessee and Virginia – account for more than 50% of malaria cases in the United States. The disease is most common in Arkansas, where in 2019 there were more than 350 cases per million people.
Several different mites transmit rickettsiae bacteria, which cause specific fevers. According to the CDC, Rocky Mountain fever is the most common disease in the United States, but most diagnostic tests cannot distinguish similar bacterial species.
American dog mites, brown dog mites, and the geographically named Rocky Mount wood tick can cause specific fevers. American dog ticks are common in the East of the Rockies, and brown dog ticks have increased the rate of RMSF transmission in Arizona in recent years.
Some types of mites can cause many diseases
Blackleg can be known to spread Lyme disease, but it can also infect bacteria and viruses that cause other diseases.
The most common of these secondary infections is anaplasmosis, a flu-like illness that affects 500 cases per million people in Maine – less than half the state’s Lyme disease incidence, but higher than the RMSF in most states. .
Like its neighbors in Massachusetts, there was the state of Lyme, but the number of cases of Lyme disease in the state decreased in 2016. At the same time, the level of anaplasmosis in the state exceeded Lyme: the same ticks, different bacteria.
Ehrlichiosis, another less common tick-borne disease, is spread by a single star tick in the southern and central United States. In Missouri, the annual rate of erysipelas is close to the RMSF rate. The disease has been reported in western Nebraska, but most cases occur in the eastern half of the country.