A woman in Maine developed a dangerous allergy to meat after a black tick-to-pronounce the CDC to re-examine which ticks can cause alpha-gal syndrome. A decade of cases suggests that the threat is wider than he believed.
Letter: ALPHA-GAL Syndrome after Ixodes Scapularis tick and state surveillance, Maine, USA, 2014-2023. Credit Picture: Aleksei Ruzhin / Shutterstock
On a recent mission published in the magazine Emerging infectious diseasesResearchers from Disease Control and Prevention Centers (CDC), Maine’s (MAINE CDC), University of North Carolina and other institutions examined a case study by Maine for establishment Ixodes scapularis As a possible carrier of alpha-gal syndrome (AGS). They evaluated retroactive positive A-Gal-specific test results and case files collected for over 10 years (2014-2023) as part of enhanced monitoring. They found that at least 23 Maine residents had similarly acquired the syndrome from unknown or possibly stars reports, underlining the need for enhanced surveillance and medical care on bites by other types of ticks.
Background
Alpha-Gal syndrome, called “mammal meat allergy” or “tick meat allergy”, is a severe allergic reaction (hypersensitivity) to the lactose-1,3-galactose disaccharide (A-GAL).
Symptoms include rash, cells, nausea or vomiting, difficulty breathing, blood pressure drop, dizziness or lightness, diarrhea, severe stomach pain and, in rare cases, anaphylaxis.
AGS is usually activated after lone star bites, Amblyomma Americanumespecially in the United States of America. The spatial distribution of the syndrome is strongly associated with the geographical distribution of Lone Star Tick.
Particularly, Ixodes Holocyclus In Australia it is also involved in activating the situation, suggesting that bites from non-star ticks (eg,, eg, Ixodes scapularis and Hemaphysal Longicornis) may be more worrying than he previously believed.
For the study
The present study is investigating the case of a 45-year-old woman depicting AGS-like symptoms after a bite of a non-star. The MAINE (MAINE CDC) Disease Control and Prevention Center conducted the study.
Schedule of the onset of symptoms in a patient with alpha-gal syndrome after Ixodes scapularis tick bite, Maine, USA, 2022.
The study subject reported a tick (left Bicep) taken on May 4, 2022, discovered after its return from York County, Maine. The subject recognized tick as an adult female Ixodes scapulariswhich was confirmed by CDC using molecular and morphological data. Nine days later, in addition to the bite area that proves inflammation and severe itching, the subject reported the delayed symptoms of gastrointestinal (GI) (abdominal pain and mistreatment) after eating roasted rabbit.
These symptoms often reappeared following the consumption of mammal meals of the subject in the next two weeks. Specifically, the meals were shared, with the only issue reporting GI symptoms. In addition, the subject had no prior history of allergies or parasite exposure.
“A serious episode of diarrhea and vomiting hours after eating beef has pushed the patient to visit a Health Care provider (HCP) 20 days after bite.”
Taking into account its symptoms, the health care provider examined the subject through a group of medical examinations, including a metabolic table, full number of blood, amylase, lipase and Pylori Breathing test. At the same time, an ultrasound (for detection of gallstones) were performed and IgE test for A-GAL-GAL was conducted. All tests showed that the subject was in good health in addition to the IgE Special A-GAL test, which was unusually high (> 100 ku/l).
Although it did not show a rash, hives, respiratory discomfort or anaphylaxis, its symptoms were consistent with the AGS gastrointestinal phenotype. Lunch sympathizers such as alcohol may have aggravated the onset of symptoms.
“Consumption of bacon in 3 months and the steak in 7 months after the first symptoms led to delayed heart senses. Ten months after the first symptoms, the patient tolerated a steak dinner and roasted beef sandwich and reiterated the red meat.
The evolution and persistence of the reaction of the bite position in the alpha-gal syndrome after the ixodes scapularis tick, Maine, USA, 2022. A) Day 1, attached ixodes scapularis adult female. B) Expanded version of the image in Table A. Zoom × 2.1; C) Day 3, increasing erythema surrounding the tick site accompanied by intense and increasing itching. D) Day 5, the bite position less inflammatory and with scabies. E) Day 53, the patient reiterated the documentation of the photos due to the persistent itching and the “flares” of the damage that is increasing from time to time. F) Day 55, the damage was improved. G) Day 57, the damage is slightly raised again, the photo taken to substantiate the variation. After these photos, itching was largely resolved. Since December 2024, the bite place remains recognizable as asymptomatic Papule.
Study and monitoring
This case study provides evidence suggesting that bites Ixodes scapularis can cause hypersensitivity and AGS to people. This, in turn, prompted the US CDC (MAINE) to retroactively assemble and display patients from Maine that covers the previous 10 years (2014-2023). Of the 57 Maine residents reporting AGS-like symptoms, IgE laboratory tests have confirmed that 23 were positive for A-Gal-specific allergies.
Interviews with AGS confirmed the cases and revisions of their travel history that preceded their symptoms revealed contact with Lone Star, Black-Legged and other ticks. However, the study acknowledges that not all reports could be confirmed and that previous awareness or multiple bites in a lifetime could contribute to the start of AGS.
Conclusions
This study suggests that non-star ticks, especially black tick legs (Ixodes scapularis), can be involved in the hypersensitivity of AGS in humans, largely expanding the possible spatial distribution of syndrome in the US.
To cope with this, the CDC has scaled surveillance and informed clinical doctors and health professionals to systematically show patients with A-Gal-specifically IGES bites.
