Key Takeaways
- Remove ticks as soon as possible using fine-tipped tweezers with steady upward pressure — do not twist, crush, or apply petroleum jelly.
- Single-dose doxycycline 200 mg prophylaxis is recommended when all four IDSA criteria are met: Ixodes tick, Lyme-endemic area, attachment ≥36 hours, and administration within 72 hours of removal.
- The erythema migrans rash appears 3–30 days after a bite, expands beyond 5 cm, and warrants clinical Lyme disease diagnosis without lab confirmation in endemic areas.
- Early Lyme disease is treated with doxycycline 100 mg twice daily for 10–21 days — most patients treated early make a full recovery.
- Rocky Mountain spotted fever can be fatal within days; start doxycycline immediately when it is suspected, without waiting for lab results.
- Lone star tick bites can trigger alpha-gal syndrome, a red-meat allergy that may appear weeks to months after the bite.
Most people who find a tick on their skin feel an immediate urge to pull it off as fast as possible — which is exactly right. What comes after that moment, though, is where decisions matter. A single tick bite can lead to Lyme disease, Rocky Mountain spotted fever, or a delayed allergy to red meat, depending on the tick species, how long it was attached, and where you live. Getting those details right determines whether you need a preventive antibiotic, watchful waiting, or urgent emergency care.
Lyme disease is now the most reported vector-borne disease in the United States, with the CDC recording 62,551 confirmed cases in 2022 — a number that significantly underestimates true incidence due to diagnostic limitations.[3] Cases are concentrated in the Northeast and upper Midwest, but reported infections have been documented in every state. The range of infected ticks continues to expand.
This guide covers everything from how to safely remove a tick to interpreting the 2020 IDSA/AAN/ACR Lyme disease clinical practice guidelines, identifying the rashes that require treatment, and recognizing the less common but serious tick-borne illnesses that get missed because they are mistaken for summer flu.
Know Your Tick: Why Species Identification Matters
Not all ticks carry the same pathogens. The species of tick attached to you directly determines your disease risk — and whether you qualify for Lyme prophylaxis. In the United States, three species account for most clinically significant tick-borne illness.
| Tick Species | Size (unfed adult female) | Appearance | Geographic Range | Diseases Transmitted |
|---|---|---|---|---|
| Ixodes scapularis Blacklegged tick / Deer tick |
~1.5 mm (sesame seed) | Orange-red body; black scutum (hard plate). Nymphs are poppy-seed sized. | Northeast, Mid-Atlantic, upper Midwest, expanding southward | Lyme disease, anaplasmosis, babesiosis, Powassan virus |
| Dermacentor variabilis American dog tick |
~5 mm (watermelon seed) | Larger body; distinctive cream or off-white scutum on dark brown background | East of Rocky Mountains; some Pacific Coast populations | Rocky Mountain spotted fever, tularemia |
| Amblyomma americanum Lone star tick |
~3 mm | Single white spot on center of female's back (the "lone star") | Southeast, South-Central, and increasingly Midwest and Northeast | Ehrlichiosis, STARI, tularemia, alpha-gal syndrome |
Size is the most practical differentiator. Deer tick nymphs — the stage responsible for most Lyme disease transmission — are roughly the size of a poppy seed.[7] They are easy to miss in a post-outdoor tick check, which is one reason Lyme disease so often goes unrecognized in the early stage when it is most treatable.
On the Pacific Coast, the western blacklegged tick (Ixodes pacificus) is the vector for Lyme disease, anaplasmosis, and babesiosis — fulfilling the same clinical role as Ixodes scapularis in the East. The same prophylaxis criteria apply. If you are hiking in coastal California, Oregon, or Washington, Ixodes pacificus is the tick to watch for.[9]
How to Remove a Tick Correctly
Speed matters. The longer a tick feeds, the higher the chance of pathogen transmission. For Lyme disease specifically, Borrelia burgdorferi transmission from an infected deer tick typically requires at least 36 hours of attachment — which is why prompt removal is the single most effective prevention step you can take.[4]
Step-by-Step Removal
- Use fine-tipped tweezers. Grasp the tick as close to the skin's surface as possible. The goal is to grip the mouthparts, not the body.
- Pull upward with steady, even pressure. Do not twist or jerk. Jerking can cause the mouthparts to break off and remain in the skin.
- Clean the bite site thoroughly with rubbing alcohol, iodine scrub, or soap and water after removal.
- Save or photograph the tick before disposal. Place it in a sealed container, wrap it in tape, or flush it down the toilet. Do not crush it with your fingers — this can release infectious fluid.
- Record the date of removal. If you develop symptoms within 30 days, this information helps your clinician assess timing and risk.
Applying petroleum jelly, nail polish, heat from a match, or other substances to "suffocate" a tick before removal is not recommended. These methods agitate the tick and may cause it to force infectious saliva into the skin. Grabbing the tick's body rather than the mouthparts risks squeezing pathogens into the bite site. Both approaches increase — not decrease — disease transmission risk.[4]
Single-Dose Doxycycline: The IDSA Prophylaxis Protocol
The 2020 IDSA/AAN/ACR Lyme disease clinical practice guidelines recommend a single oral dose of doxycycline after a tick bite — but only when specific criteria are met.[1] Prescribing it indiscriminately for any tick bite is not supported by evidence and contributes to antibiotic resistance. All four of the following conditions must be present.
| Criterion | Details | Why It Matters |
|---|---|---|
| 1. Tick species | Confirmed or likely Ixodes spp. (deer tick or western blacklegged tick) | Only Ixodes ticks transmit Borrelia burgdorferi. Dog ticks and lone star ticks do not. |
| 2. Endemic area | Bite occurred in a Lyme-endemic region (Northeast, upper Midwest, Pacific coast) | Tick infection rates vary by geography. In non-endemic areas, risk is negligible even after an Ixodes bite. |
| 3. Attachment time | Tick was attached for ≥36 hours (engorged appearance is the practical indicator) | Transmission requires prolonged feeding. A flat, unengorged tick has almost certainly been attached less than 36 hours. |
| 4. Time since removal | Prophylaxis can be administered within 72 hours of tick removal | Beyond 72 hours, the benefit of prophylaxis is not established. Watchful monitoring is used instead. |
When all four criteria are met, the recommended dose is doxycycline 200 mg as a single oral dose for adults, or 4.4 mg/kg (maximum 200 mg) for children weighing less than 45 kg.[2] A single dose taken within this window reduces Lyme disease risk by approximately 87%, according to research published in Open Forum Infectious Diseases.[6]
When the criteria are not fully met, the IDSA guidelines recommend against antibiotic prophylaxis. Instead, monitor for symptoms — especially erythema migrans rash and flu-like illness — for 30 days following the bite. If symptoms appear, seek clinical evaluation promptly.
For children of any age, a single dose of doxycycline is supported for Lyme prophylaxis when criteria are met — earlier dental staining concerns applied to prolonged antibiotic courses, not a one-time dose. For pregnant women, the 2020 IDSA guidelines advise against routine doxycycline prophylaxis; close watchful monitoring and a clinical conversation about individual risk factors is the standard approach.[1]
Recognizing the Erythema Migrans Rash
The erythema migrans (EM) rash is the most reliable early sign of Lyme disease and the one finding that allows clinical diagnosis without laboratory testing. In a patient who lives in or has recently traveled to a Lyme-endemic area and presents with a characteristic EM rash, the 2020 IDSA guidelines state clearly: treat for Lyme disease without waiting for serologic confirmation.[1]
What to Look For
- Timing: Appears 3–30 days after the tick bite, with an average of about 7 days.[3]
- Size: Expands gradually, typically reaching at least 5 cm (about 2 inches) across, often much larger — sometimes 30 cm or more.
- Appearance: The classic presentation is a target or bull's-eye — a central clearing surrounded by an expanding red ring. However, many EM rashes are uniformly red, oval, or irregularly shaped without a classic bull's-eye pattern. Both are diagnostic.
- Texture: Warm to touch. Rarely itchy or painful. This distinguishes it from a local reaction to the bite itself, which is usually a small raised bump that resolves within 1–2 days.
- Location: Can appear anywhere on the body, not just at the bite site. Multiple EM rashes elsewhere on the body indicate early disseminated Lyme disease.
About 20–30% of people with Lyme disease never develop or notice an EM rash.[5] A negative rash does not rule out Lyme disease. If you had a tick bite 1–4 weeks ago and are now experiencing unexplained fever, fatigue, muscle and joint aches, or swollen lymph nodes — even without a rash — a clinical evaluation is appropriate.
Patients and even some clinicians wait for the classic bull's-eye pattern before acting on a rash. This is a mistake. Many EM rashes never develop central clearing. Any expanding red rash appearing at a tick bite site within 30 days — regardless of pattern — should be evaluated as possible Lyme disease. Rashes on darker skin can also be harder to see and may not appear as prominently red.
Lyme Disease Stages: What Happens If It Goes Untreated
Lyme disease caused by Borrelia burgdorferi progresses through three stages if untreated. Early treatment at Stage 1 is associated with full recovery in most patients. The stakes increase substantially with each stage.
Stage 1: Early Localized (Days to ~1 Month After Bite)
The bacteria remain near the bite site. The EM rash is the hallmark. Accompanying symptoms often resemble flu: fever, fatigue, headache, muscle aches, and joint pain that moves around the body. Swollen lymph nodes near the bite site are also common.[5] Patients treated with antibiotics at this stage have excellent outcomes.
Stage 2: Early Disseminated (Weeks to Months After Bite)
The bacteria spread through the bloodstream to other organs. This stage can involve multiple EM rashes at sites distant from the bite; neurologic complications including facial palsy (Bell's palsy) on one or both sides; meningitis with severe headache and neck stiffness; radiculoneuritis causing shooting pains or numbness; and Lyme carditis, which causes heart block and can produce palpitations, dizziness, or fainting.[7] Meningitis and carditis are potentially serious — both warrant prompt medical attention.
Stage 3: Late Disseminated (Months to Years After Bite)
The most characteristic late-stage manifestation in the United States is Lyme arthritis — intermittent or persistent joint pain, warmth, and swelling, most often in the knees.[7] Pain can be severe. Late neurologic Lyme disease can cause cognitive symptoms including difficulty concentrating, memory problems, and nerve pain in the hands and feet. Late disseminated Lyme is treatable but takes longer to resolve, and some patients experience prolonged symptoms after completing antibiotic therapy.
Lyme Disease Treatment: What the 2020 Guidelines Recommend
The 2020 IDSA/AAN/ACR guidelines provide specific antibiotic recommendations based on disease stage and presentation. Treatment chosen early — at the EM rash stage — is the most effective.[1]
Early Localized Lyme Disease (Erythema Migrans)
Oral antibiotics are the standard of care. The first-line regimens are:
- Doxycycline 100 mg twice daily for 10 days (adults; 4.4 mg/kg/day divided twice daily for children)
- Amoxicillin 500 mg three times daily for 14 days (alternative for patients who cannot take doxycycline)
- Cefuroxime axetil 500 mg twice daily for 14 days (another oral alternative)
Doxycycline has the advantage of also covering anaplasmosis, which can coinfect patients bitten by deer ticks — making it the preferred agent for most adults without contraindications.
Early Disseminated Lyme Disease
Neurologic involvement such as meningitis, radiculoneuritis, and cranial neuropathy can often be treated with oral doxycycline at 200 mg per day for 14–21 days, though intravenous ceftriaxone or penicillin G is also effective. Lyme carditis is treated orally in outpatients, with IV ceftriaxone reserved for hospitalized patients until stabilization.[1]
Lyme Arthritis (Late Disseminated)
Oral doxycycline or amoxicillin for 28 days is the initial treatment. Patients who do not respond to a first oral course may receive a second course or IV ceftriaxone. Most patients with Lyme arthritis improve substantially with antibiotic treatment, though joint inflammation can persist for weeks to months after the infection has been cleared.
Some patients experience lingering fatigue, pain, or cognitive difficulty for months after completing antibiotic therapy. This is referred to as post-treatment Lyme disease syndrome (PTLDS). The 2020 IDSA guidelines do not recommend extended antibiotic courses for PTLDS — clinical trials have not shown benefit over placebo, and prolonged antibiotic use carries its own risks. Management focuses on symptom relief and functional rehabilitation while the immune system continues to resolve inflammation.
Other Tick-Borne Diseases: When the Diagnosis Isn't Lyme
Lyme disease gets most of the attention, but other tick-borne illnesses can be serious — and some are more immediately dangerous than Lyme. Several are transmitted by the same deer tick that causes Lyme, meaning coinfection is possible.
Anaplasmosis
Caused by Anaplasma phagocytophilum, transmitted by deer ticks, anaplasmosis is most common in the Northeast and upper Midwest. It presents within 1–2 weeks of a tick bite with fever, severe headache, muscle aches, and characteristic lab findings including low white blood cell and platelet counts and elevated liver enzymes.[8] Doxycycline 100 mg twice daily is the treatment; most patients respond dramatically within 24–48 hours. Patients with Lyme disease and a persistent fever beyond one day on treatment should be evaluated for anaplasmosis coinfection.
Babesiosis
Also transmitted by deer ticks, babesiosis is caused by a malaria-like parasite (Babesia microti) that infects red blood cells. It can be asymptomatic in healthy adults but cause severe hemolytic anemia in elderly, asplenic, or immunocompromised patients. The treatment of choice is oral atovaquone plus azithromycin for 7–10 days; severe cases require IV clindamycin plus quinine or exchange transfusion.[8]
Rocky Mountain Spotted Fever (RMSF)
RMSF is caused by Rickettsia rickettsii, transmitted primarily by the American dog tick (Dermacentor variabilis) in the East and the Rocky Mountain wood tick (Dermacentor andersoni) in the West. Despite the name, RMSF is most common in the South-Atlantic states — particularly North Carolina — and Oklahoma. It is the most lethal tick-borne disease in the United States when untreated.[8]
Classic RMSF presents with fever, severe headache, and a petechial rash — small red or purple dots under the skin that begin on the wrists and ankles and spread centrally to the trunk. The rash often appears on day 2–5 of illness. When RMSF is clinically suspected, doxycycline should be started immediately, without waiting for laboratory confirmation. A delay of even a day or two can be fatal.
Ehrlichiosis
Caused by Ehrlichia chaffeensis, transmitted by the lone star tick, ehrlichiosis shares many features with anaplasmosis — fever, headache, low blood counts, elevated liver enzymes. It is treated with doxycycline for a minimum of 10 days, continuing at least 3 days after fever resolves.[8] The lone star tick's geographic range encompasses much of the South and is expanding northward, so ehrlichiosis is increasingly seen outside traditionally endemic areas.
Alpha-Gal Syndrome
Alpha-gal syndrome (AGS) is a delayed food allergy to red meat and other mammalian products — triggered not by the disease itself but by the immune response to a sugar molecule called alpha-gal introduced through a lone star tick bite.[9] The CDC formally recognized AGS as a growing public health concern in 2023. Reactions typically occur 2–6 hours after eating beef, pork, lamb, or products derived from mammals such as dairy or gelatin. Symptoms range from hives and gastrointestinal upset to anaphylaxis. The delayed nature of reactions — hours after the meal — makes patients and clinicians slow to connect the allergy to a tick bite that may have occurred weeks or months earlier.
If you develop unexplained allergic reactions to red meat and live in an area with lone star ticks, bring this possibility up with your physician. Diagnosis involves a blood test for IgE antibodies to alpha-gal. Management requires strict avoidance of mammalian meat and products, plus carrying an epinephrine auto-injector for severe reactions.
Where Lyme Disease Risk Is Highest in the United States
Lyme disease risk is not uniform across the country. The geographic distribution of Ixodes scapularis ticks and B. burgdorferi infection rates together determine where antibiotic prophylaxis after a tick bite is most warranted.
Highest incidence states include Connecticut, Delaware, Maine, Maryland, Massachusetts, Minnesota, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont, Virginia, West Virginia, and Wisconsin, plus Washington D.C.[3] Rhode Island, Vermont, and Maine report the highest per-capita rates — in 2022, Rhode Island recorded 212 cases per 100,000 residents.
Expanding range: The geographic footprint of Lyme-endemic areas has grown substantially since the 1990s, driven by reforestation, suburban development in wooded areas, and changing climate conditions that extend tick activity seasons. States previously considered low-risk, including Ohio, Michigan, North Carolina, and parts of the Southeast, are experiencing documented increases in tick populations and Lyme disease cases.
Pacific Coast: California, Oregon, and Washington have established populations of Ixodes pacificus, and Lyme disease cases occur primarily in coastal and forested areas. Overall incidence rates are lower than in the Northeast, but risk is real for people hiking or camping in known tick habitat.
If you are unsure whether a tick bite occurred in a Lyme-endemic area, the CDC Lyme disease case maps and your state health department's tick surveillance data are the most reliable references. When in doubt, a telehealth consultation allows a clinician to assess your specific geographic and clinical risk in real time.
Red Flags: When to Seek Emergency Care
Most tick bites and even early Lyme disease can be managed through a primary care or telehealth visit. A few situations require emergency evaluation without delay.
- High fever (103°F / 39.4°C or above) with severe headache and neck stiffness — possible meningitis or RMSF
- Petechial rash (small red or purple non-blanching spots, especially on wrists and ankles) — RMSF until proven otherwise
- Fainting, near-syncope, or severe palpitations — possible Lyme carditis with high-degree heart block
- Facial droop or sudden muscle weakness — may indicate early disseminated Lyme disease with neurologic involvement
- Confusion, altered mental status, or inability to stay awake — severe systemic infection
- Anaphylaxis after eating red meat — possible alpha-gal syndrome requiring epinephrine and emergency management
- Shortness of breath, chest pain, or extremely rapid or irregular heartbeat — Lyme carditis or other systemic illness
For symptoms that are concerning but not immediately threatening — a rash that may be erythema migrans, flu-like illness after a tick bite, or questions about prophylaxis eligibility — a telehealth visit provides fast access to clinical judgment without an unnecessary emergency room trip.
Practical Tick Prevention
Prevention is far more straightforward than treatment. Ticks are slow-moving and must crawl to a feeding site, which means a few practical habits eliminate most of the risk.
Before Going Outdoors
- Use EPA-registered repellents. DEET (20–30%) applied to exposed skin, or permethrin applied to clothing and gear (not skin), are both effective. Permethrin-treated clothing retains efficacy through multiple washes.
- Wear protective clothing in wooded or grassy areas — long pants tucked into socks, long sleeves. Light-colored clothing makes ticks easier to spot.
After Coming Indoors
- Do a full-body tick check within 2 hours. Ticks favor warm, hidden areas: scalp, behind the ears, under the arms, inside the belly button, behind the knees, between the legs, and around the waist.
- Shower promptly. Showering within 2 hours of coming indoors has been shown to reduce Lyme disease risk and helps wash off unattached ticks.
- Tumble dry clothing on high heat for 10 minutes to kill ticks that may be on fabric.
- Check pets that spend time outdoors. Ticks on pets can detach and find human hosts indoors.
Frequently Asked Questions
Most tick bites do not require emergency care. Remove the tick promptly with fine-tipped tweezers, clean the bite site, and monitor for symptoms over the next 30 days. Go to the ER immediately if you develop a high fever (above 103°F), a petechial rash (small red or purple dots under the skin), severe headache with neck stiffness, difficulty breathing, confusion, or rapid deterioration. These may indicate Rocky Mountain spotted fever or another serious tick-borne illness requiring urgent treatment.
No. Only Ixodes (deer/blacklegged) ticks transmit Lyme disease, and not all of them carry Borrelia burgdorferi. Even in highly endemic areas, roughly 1–3% of deer tick bites result in Lyme disease. Transmission also requires the tick to be attached for at least 36 hours. Dog ticks and lone star ticks do not transmit Lyme disease, though they carry other pathogens.
Transmission risk correlates with how engorged the tick is. An engorged tick — swollen with blood, several times its unfed size — has likely been attached for 36–72 hours or more. A flat, unengorged tick has usually been attached for less than 36 hours, significantly reducing Lyme transmission risk. The degree of engorgement is the most practical field assessment available. If you cannot evaluate the tick, save or photograph it before disposal.
Single-dose doxycycline 200 mg is recommended when all four IDSA criteria are met: the tick is an Ixodes species, the bite occurred in a Lyme-endemic area, the tick was attached for 36 hours or longer, and prophylaxis can be administered within 72 hours of removal. When criteria are not fully met, watchful monitoring rather than antibiotics is appropriate. Antibiotic prophylaxis for every tick bite is not supported by evidence and promotes antibiotic resistance.
Erythema migrans begins as a small red spot at the bite site and expands over days to weeks, typically reaching 5 cm (2 inches) or more — often much larger. The classic presentation is a target or bull's-eye with a central clearing surrounded by an outer red ring. Many EM rashes are a solid, uniformly expanding oval or circle without central clearing — both presentations are diagnostic. The rash appears 3–30 days after the bite, is warm to touch, and is usually not itchy or painful. It occurs in roughly 70–80% of Lyme disease cases.
Alpha-gal syndrome (AGS) is a delayed allergic reaction to red meat and other mammalian products, triggered by a lone star tick bite. The tick introduces a sugar molecule called alpha-gal, which sensitizes the immune system. After sensitization, eating beef, pork, lamb, or mammalian-derived products like dairy or gelatin can cause reactions 2–6 hours later — ranging from hives and abdominal pain to anaphylaxis. The delayed timing makes the connection to food difficult to recognize without specialist evaluation. A blood test for IgE antibodies to alpha-gal confirms the diagnosis.
Rocky Mountain spotted fever is transmitted by dog ticks, not deer ticks, and is the more immediately dangerous disease. Without treatment it can be fatal within days. The characteristic petechial rash — small red or purple dots that do not blanch when pressed — typically starts on the wrists and ankles and spreads toward the trunk. Lyme disease develops more slowly and rarely causes rapid deterioration in the early stages. When RMSF is suspected based on symptoms and tick exposure, doxycycline should be started immediately without waiting for laboratory confirmation.
Yes. Lyme disease does not confer lasting immunity, and reinfection after another qualifying tick bite is possible. This is distinct from post-treatment Lyme disease syndrome, where symptoms persist after treatment, or from incomplete treatment of the original infection. If you have had Lyme disease before, full prevention practices — tick checks, repellents, protective clothing, and prompt removal — remain just as important every tick season.
Current evidence supports a single dose of doxycycline for children of any age when Lyme prophylaxis criteria are met. Earlier restrictions were based on the risk of dental staining from prolonged doxycycline courses — not a single dose. Children under 45 kg receive 4.4 mg/kg up to a maximum of 200 mg. For pregnant women, the 2020 IDSA guidelines recommend against routine prophylaxis with doxycycline; individual risk assessment with a physician is the appropriate approach.
Size is the most reliable visual difference. Deer ticks (Ixodes scapularis) are very small — a nymph is about the size of a poppy seed, and an unfed adult female is roughly the size of a sesame seed. Adult female deer ticks have an orange-red body with a black scutum (the hard back plate). Dog ticks (Dermacentor variabilis) are considerably larger, with a distinctive cream or off-white scutum that contrasts sharply against a dark brown body. Lone star ticks fall between the two in size and have a single prominent white spot in the center of the female's back. When uncertain, photograph the tick before disposal.
References
- Infectious Diseases Society of America, American Academy of Neurology, American College of Rheumatology. 2020 Guidelines for the Prevention, Diagnosis, and Treatment of Lyme Disease. https://www.idsociety.org/practice-guideline/lyme-disease/
- Centers for Disease Control and Prevention. Lyme Disease Post-Exposure Prophylaxis Algorithm. https://www.cdc.gov/lyme/resources/pdfs/lyme-pep-low-ink-p.pdf
- Centers for Disease Control and Prevention. Lyme Disease Case Maps. Last updated June 4, 2025. https://www.cdc.gov/lyme/data-research/facts-stats/lyme-disease-case-map.html
- Centers for Disease Control and Prevention. What to Do After a Tick Bite. Last updated July 15, 2025. https://www.cdc.gov/ticks/after-a-tick-bite/index.html
- Harvard Health Publishing Lyme Wellness Initiative. Lyme Disease Stages and Symptoms. Updated February 24, 2025. https://www.lyme.health.harvard.edu/stages-and-symptoms/
- Wychgram C, Aucott J. Lyme Disease Prophylaxis by Single-Dose Doxycycline in the Outpatient Setting. Open Forum Infectious Diseases. October 2024. https://pmc.ncbi.nlm.nih.gov/articles/PMC11521345/
- Mayo Clinic. Lyme Disease — Symptoms and Causes. https://www.mayoclinic.org/diseases-conditions/lyme-disease/symptoms-causes/syc-20374651
- Biggs HM, Behravesh CB, Bradley KK, et al. Diagnosis and Management of Tickborne Rickettsial Diseases. MMWR Recommendations and Reports 2016;65(No. RR-2):1–44. https://www.cdc.gov/mmwr/volumes/65/rr/rr6502a1.htm
- Mayo Clinic. Alpha-Gal Syndrome — Symptoms and Causes. Updated August 8, 2025. https://www.mayoclinic.org/diseases-conditions/alpha-gal-syndrome/symptoms-causes/syc-20428608
- American Academy of Family Physicians. Tickborne Diseases: Diagnosis and Management. American Family Physician. May 1, 2020;101(9):530–540. https://www.aafp.org/pubs/afp/issues/2020/0501/p530.html
- PubMed. Clinical Practice Guidelines by the IDSA, AAN, and ACR: 2020 Guidelines for Lyme Disease. Published January 3, 2021. https://pubmed.ncbi.nlm.nih.gov/33251700/