Which Ticks Carry Lyme Disease?

Bill Swank
First Published: | Updated: February 27, 2024

Stepping out for a nature walk, gardening, or simply spending time outdoors can bring you in close quarters with ticks. Beware, certain types carry Lyme disease — a bacterial infection known to pose a variety of health issues. It’s crucial to understand the threats these tiny creatures pose, which ones carry this disease, how they transmit it, and how you can protect yourself.

In this comprehensive guide, we’ll explore all these topics, including the prevalence of Lyme disease in ticks, the specific species carrying it, its symptoms, and prevention measures. This knowledge is valuable in preventing the spread of Lyme disease and keeping your outdoor activities worry-free.

  • Lyme disease, a common vector-borne disease in the U.S., is caused by the bacterium Borrelia burgdorferi, which is transmitted to humans primarily through the bites of infected black-legged ticks and western black-legged ticks.
  • It’s vital to understand that not all ticks are carriers of this bacterium; only certain ones that have fed on an infected host like mice or deer can transmit Lyme disease.
  • The likelihood of contracting Lyme disease from a tick bite depends on various factors. These include the type of tick, how long the tick has been attached, the tick’s infection status, and the geographic location.
  • Recognizable symptoms of Lyme disease, such as the ‘bull’s-eye’ rash and flu-like symptoms, can help in early detection and treatment, which usually involves antibiotic therapy. However, not all individuals infected with Lyme disease will observe these symptoms.
  • Lyme disease prevention primarily involves avoiding tick bites. This can be accomplished by using insect repellents, doing daily tick checks after being outdoors, showering shortly after outdoor activities to wash off unattached ticks, and wearing light-colored clothes to make it easier to spot ticks. If a tick bite does occur, removing the tick promptly can help prevent infection.

Table of Contents

Get To Know Lyme Disease

What is Lyme disease?

Lyme disease is an infectious disease caused by a spirochete bacterium known as Borrelia burgdorferi. This bacterium infests ticks, particularly the blacklegged tick (Ixodes scapularis) and the western blacklegged tick (Ixodes pacificus), which spreads it to humans through their bites.

What is the cause of Lyme disease?

As mentioned, the bacterial spirochete Borrelia burgdorferi causes Lyme disease. It’s not a disease that can be transmitted from person to person. Instead, an infected tick bite is the primary mode of transmission. These ticks acquire the bacteria by feeding on infected animals like mice and deer.

Is Lyme disease rare or common?

It’s far from rare. In fact, the Centers for Disease Control and Prevention estimates that around 300,000 annual Lyme disease infections occur in the United States, making it the most commonly reported vector-borne illness in the country. It’s especially prevalent in the northeast, mid-Atlantic, and north-central parts of the U.S., as well as on the Pacific Coast.

The Ticks That Carry Lyme Disease

Do all ticks carry Lyme disease?

No, not all ticks carry the Lyme disease-causing bacterium. In the US, it’s primarily the blacklegged tick, often referred to as a deer tick, and the western blacklegged tick that are vectors for Lyme disease.

Which ticks carry Lyme disease?

Blacklegged Tick/Deer Tick (left) | Western Blacklegged Tick (right)

As mentioned, the blacklegged and western blacklegged ticks that carry Lyme disease bacterium are the primary vectors of the said disease. They typically contract the bacterium by feeding on infected animals such as mice and deer.

What type of ticks carry Lyme disease?

While several types of ticks can carry various bacteria and pathogens, the specific types known for transmitting Lyme disease are the:

Tick SpeciesCommon NameImageGeographical Location
Ixodes scapularisBlacklegged TickNortheastern, North-central, and Eastern United States
Ixodes pacificusWestern Blacklegged TickPacific Coast, especially Northern California
Ixodes ricinusCastor Bean TickEurope and parts of North Africa
Ixodes persulcatusTaiga TickParts of Europe and Asia, notably Russia and Northern Asia

This helps clarify which ticks are potential carriers of Lyme disease and where they are commonly found, enabling better prevention and awareness.

What are the differences between a normal tick bite and a Lyme tick bite?

A significant difference between a normal tick bite and a Lyme-infected tick bite is the presence of a rash. A Lyme tick bite often results in a specific rash called erythema migrans. This rash usually starts out small at the site of the tick bite and then expands over several days or weeks to reach up to 12 inches or more in diameter. It often resembles a “bull’s-eye” and might feel warm but isn’t usually painful or itchy.

Appearance of erythema migrans on human skin

However, it’s important to note not everyone who gets Lyme disease observes this rash. Beyond the rash, flu-like symptoms such as fever, fatigue, and muscle aches may also occur following a Lyme tick bite.

The Prevalence of Lyme Disease in Ticks

Understanding the prevalence of Lyme disease in different regions can help highlight areas where the risk of encountering infected ticks is higher. Below is a table that details the percentage of ticks carrying the Lyme disease bacterium, Borrelia burgdorferi, across various U.S. regions:

RegionPercentage of Ticks Carrying Lyme Disease
Pacific Coast15-25%
Southeast (lower risk)1-5%

What percentage of ticks carry Lyme disease?

In Lyme-endemic areas, an estimated 20% to 50% of ticks carry Borrelia burgdorferi, the bacterium causing Lyme disease. These percentages fluctuate depending on the location and the type of tick species present.

How often do ticks carry Lyme disease?

Ticks carry Lyme disease relatively frequently in endemic areas. However, keep in mind that a tick needs to be infected with the bacterium to transmit Lyme disease, and not all ticks are infected.

How do ticks get Lyme disease?

Ticks become infected with Lyme disease when they feed on animals, such as mice or deer, that carry the Borrelia burgdorferi bacterium. The bacterium then resides in the gut of the tick and can be transmitted to humans and other animals during a subsequent blood meal.

How do ticks transmit Lyme disease?

The transmission of Lyme disease to humans occurs when an infected tick bites the skin to feed on blood. The table below outlines these key factors and how they contribute to the disease’s transmission process:

FactorDescriptionImpact on Transmission
Type of TickSpecies of tick (e.g., blacklegged tick)Primary carriers have a higher likelihood of being infected.
Infection StatusWhether the tick is infected with Borrelia burgdorferiOnly infected ticks can transmit Lyme disease.
Duration of AttachmentTime the tick remains attached to the hostLonger attachment (typically 36-48 hours) increases risk of transmission.
Tick RemovalHow the tick is removedImproper removal can increase the chance of transmitting the bacterium.

What are the chances of getting Lyme disease from a tick?

The chances of getting Lyme disease from a tick bite vary based on several factors, including the:

  • The type of tick
  • The tick’s stage in the life cycle
  • Where you acquired the tick
  • How long the tick was attached to you

In some regions, about one in four ticks may be infected, but the risk of getting Lyme disease from a single tick bite is estimated to be less than 3-5%.

Specific Ticks and Their Association with Lyme Disease

What is a deer tick?

An engorged deer tick (left) vs. hungry, unfed tick (right)

A deer tick, or blacklegged tick (Ixodes scapularis), is a type of tick that is well-known for being a carrier of Lyme disease. They are called deer ticks as they often feed on white-tailed deer, however, they also feed on other large mammals, including humans.

Do all deer ticks carry Lyme disease?

A deer infested with ticks

No, all deer ticks do not carry Lyme disease. Only those that have fed on an infected host, such as a mouse or deer, carry the Lyme disease bacterium.

What percent of deer ticks carry lyme disease?

The percentage of deer ticks carrying Lyme disease can vary significantly by region. In areas where Lyme disease is more prevalent, up to 50% of ticks may be infected. However, the average across all regions shows approximately 20-30% of deer ticks carry the disease.

Transmission of Lyme Disease from Ticks to Humans

Do all tick bites cause Lyme disease?

No, all tick bites do not cause Lyme disease. Only ticks that are infected with the Borrelia burgdorferi bacterium can transmit Lyme disease. Furthermore, the tick must be attached and feeding for at least 36-48 hours for the bacterium to be successfully transmitted to a human.

What are the chances of getting Lyme disease from a tick bite?

The probability of acquiring Lyme disease from a tick depends on several factors, including the type of tick, the tick’s infection status, how long the tick was attached, and the geographical location. Considering these factors, it’s estimated that the likelihood of contracting Lyme disease from a single infected tick bite can be as low as 3-5%.

What factors influence the transmission of Lyme disease from a tick bite?

Several factors can influence the transmission of Lyme disease. These include:

  • Type of Tick: Blacklegged ticks and western blacklegged ticks are the primary vectors for Lyme disease. Identifying these specific ticks can significantly assess the risk.
  • Infection Status of the Tick: Only ticks that are infected with the Lyme disease bacterium, Borrelia burgdorferi, can transmit the disease to humans.
  • Duration of Attachment: The longer a tick remains attached and feeding, the greater the risk of transmitting Lyme disease. Transmission risk significantly increases after 36-48 hours of uninterrupted feeding.
  • Method of Tick Removal: Proper removal of the tick reduces the risk of infection. Incorrect removal can increase the chances of transmitting the bacterium.
  • Geographical Location: Areas known for a higher prevalence of Lyme disease-infected ticks, such as the Northeastern and North-central U.S., present a higher risk of transmission.

Understanding these factors can help in better prevention and timely response to tick bites, reducing the likelihood of Lyme disease transmission.

Geographic Distribution and Prevalence of Lyme Disease

The geographic distribution of Lyme disease varies significantly across different regions, reflecting the prevalence of infected ticks in those areas. The table below highlights where Lyme disease is most common in the United States, providing insight into the areas where precautions are particularly necessary:

RegionPrevalence of Lyme DiseaseNotable Details
Northeastern USVery HighHighest number of cases, primarily due to Ixodes scapularis
North-central USHighSignificant cases, especially in Wisconsin and Minnesota
Pacific CoastModerateMostly northern California, due to Ixodes pacificus
Southeastern USLowFewer cases, less common presence of infected ticks

Where is Lyme disease most common?

In the United States, Lyme disease is most common in:

  1. The Northeastern states from Virginia to Maine
  2. The North-central states, mainly Wisconsin and Minnesota, and
  3. The West Coast, particularly northern California.

What are the endemic areas for Lyme disease?

Lyme disease is endemic in the Northeastern, North-central, and Western regions of the United States. It is also found in parts of Europe and Asia.

Where do Lyme disease ticks live?

Ticks that carry Lyme disease are found in grassy, heavily wooded areas where they can easily come into contact with animals, such as deer and mice, for blood meals. They can also be found in your backyard if it has ideal environments such as shrubs, leaf piles, or tall grasses.

Where is Lyme disease most common in the United States?

Lyme disease is most prevalent in the Northeastern, North-central, and Western regions of the United States, particularly in states like:

  • Connecticut
  • Delaware
  • Maine
  • Maryland
  • Massachusetts
  • Minnesota
  • New Hampshire
  • New Jersey
  • New York
  • Pennsylvania
  • Rhode Island
  • Vermont
  • Virginia
  • Wisconsin

Symptoms and Potential Severity of Lyme Disease

Recognizing the symptoms of Lyme disease is crucial for early detection and effective treatment. The table below outlines the progression of symptoms from early to late stages, helping individuals identify and respond to potential Lyme disease infections:

StageSymptomsPotential Severity
Early Localized– Erythema migrans (‘bull’s-eye’ rash)Generally mild, treatable with antibiotics
– Fever, chills, headache, fatigue, muscle and joint aches
Early Disseminated– Multiple erythema migransModerate, may require extended treatment
– Bell’s palsy, heart palpitations, meningitis
Late Disseminated– Arthritis with severe joint pain and swellingCan be severe and disabling
– Cognitive defects, sleep disturbances, chronic pain

What are the symptoms of Lyme disease?

Lyme disease often presents as a variety of health issues, making it hard to diagnose at times. The earliest and most common symptom is a rash known as erythema migrans. This rash often forms a ‘bull’s-eye’ pattern and tends to expand over time. However, it’s important to note that not all infected individuals develop this rash.

Other early symptoms can include fatigue, chills, fever, headache, muscle and joint aches, and swollen lymph nodes. If left untreated, later symptoms could develop, such as loss of muscle tone or “droop” on one or both sides of the face (known as Bell’s palsy), severe headaches due to meningitis, and heart palpitations.

Can a tick bite kill you?

Deer tick bite

Tick bites can be dangerous. While it’s extremely rare, complications from a tick bite, such as severe allergic reactions or tick-borne diseases like Lyme disease, can sometimes be serious enough to be life-threatening. However, such instances are the exception rather than the rule.

Can Lyme disease kill you?

While Lyme disease is typically not fatal, it can lead to serious complications if left untreated. The table below outlines the potential severe health issues associated with Lyme disease, highlighting the importance of timely diagnosis and treatment:

ComplicationSymptoms and EffectsPotential Severity
Heart rhythm irregularitiesCan cause palpitations, fainting, or chest painPotentially life-threatening
Neurological disorders (e.g., meningitis)Severe headaches, neck stiffness, sensitivity to lightSerious, requires medical intervention
Cognitive impairmentsMemory loss, difficulty concentratingLong-term impact on quality of life
ArthritisSevere joint pain and swellingCan be disabling without treatment

However, with early detection and appropriate antibiotic treatment, the prognosis for Lyme disease is generally very good.

How to tell if a tick bite has caused Lyme disease?

Identifying Lyme disease early can significantly improve the effectiveness of treatment and reduce the risk of severe complications. Here are key symptoms to watch for if you suspect a tick bite might have transmitted Lyme disease:

  • Erythema Migrans (Bull’s Eye Rash): This distinctive rash is the most common early sign of Lyme disease, appearing at the site of the tick bite and expanding over time.
  • Fever: A sudden fever following a tick bite can indicate an infection.
  • Fatigue: Excessive tiredness that does not seem normal post-outdoor activity may be a sign of Lyme disease.
  • Headaches: New onset of severe headaches can occur with Lyme disease.
  • Muscle and Joint Aches: Unexplained muscle soreness and joint pain, which are not related to physical exertion, may also indicate Lyme.

If you experience any of these symptoms following a tick bite, it’s essential to consult a healthcare provider promptly for assessment and possible treatment. Early intervention is key to managing Lyme disease effectively.

Prevention and Treatment of Lyme Disease

How can one tell if a tick has Lyme disease?

Unfortunately, there’s no way to tell by looking at it if a tick is infected with the bacterium that causes Lyme disease. Lab testing is the only surefire way to determine if a tick carries these bacteria. However, if you’ve been bitten by a tick found in an area known for Lyme disease, you should watch for signs of the illness and consult a healthcare provider as soon as possible if symptoms arise.

How can Lyme disease be prevented and treated?

Preventing Lyme disease is crucial, especially in areas where Lyme-carrying ticks are prevalent, and effective treatment is vital for those infected. Below is a table that outlines the strategies for prevention and the general approaches to treatment, helping to ensure that individuals are both protected against and prepared to address Lyme disease effectively:

PreventionUse insect repellentsApply repellents containing DEET or permethrin to skin and clothing.
Perform daily tick checksCheck your entire body for ticks after being outdoors, especially in wooded or grassy areas.
Shower after outdoor activitiesHelps wash off unattached ticks and is a good opportunity to check for any ticks on your body.
Wear light-colored clothingMakes it easier to spot ticks on your clothing before they attach to the skin.
TreatmentRemove ticks promptly and correctlyUse fine-tipped tweezers to grasp the tick as close to the skin’s surface as possible.
Consult healthcare immediately if symptoms appearEarly treatment typically involves antibiotics and is most effective when started early.
Follow up for recurring symptomsSome symptoms might require prolonged treatment or further medical investigation.

If you do get bitten by a tick, removing it as soon as possible can help prevent infection, as it usually takes about 36 to 48 hours for the bacterium to transfer after a tick bite.


By staying informed about ticks and Lyme disease, we can minimize the risks and lessen the spread of this disease. Remember, prevention is always better than cure. Keep yourself safe and remain vigilant about ticks.

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