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Scientist Working to Improve Diagnosis of Lyme Disease and Other Tick-Borne Illnesses

Posted By: CrystalRiver
Date: Saturday, 9-Jan-2021 07:27:42
www.rumormill.news/138816

Scientist Working to Improve Diagnosis of Lyme Disease and Other Tick-Borne Illnesses
Posted December 3, 2019

Charles Chiu M.D., Ph.D., University of California, San Francisco

Dr. John Belisle
Dr. Charles Chiu
Documented cases of tick-borne diseases (TBDs), such as spotted fever rickettsiosis, anaplasmosis, ehrlichiosis, babesiosis, tularemia, Powassan virus disease, and Lyme disease are on the rise, with Lyme disease being the most prevalent. In 2017, the Centers for Disease Control and Prevention reported a total of 59,349 cases of TBDs, representing an increase of just over 10,000 cases from the previous year.1 As tick populations continue to expand and case numbers continue to rise, the need for sensitive, specific, and rapid diagnostics assays becomes more urgent as many TBD cases go unreported, undiagnosed, or misdiagnosed.

The currently available clinical test for the diagnosis of Lyme disease is a two-tier serology-based screening that relies solely on the patient’s antibody response. The first tier is an enzyme linked immunosorbent assay (ELISA) (or immunofluorescence assay) to evaluate the patient’s blood for the presence of antibodies that are specific for the bacterium that causes Lyme disease (Borrelia burgdorferi) If positive or ambiguous, the patient’s samples are then sent for a second tier Western blot (or possibly the recently Food and Drug Administration-approved Tier 2 ELISA) in which a more specific antibody assay is performed to evaluate the presence of immunoglobulin (Ig) M or IgG. Unfortunately, the sensitivity of this two-tier system is relatively low during early infection, ranging from 30-40%, as the patient is only just mounting an antibody response.2 Notably, treatment in the early phase of infection prevents potential late-stage complications of disseminated Lyme disease, including arthritis, neurological symptoms, and cardiac arrhythmias.3 When patients present later, the two-tier testing has 70-100% sensitivity2; however, diagnostics solely based on serology may be unable to distinguish between current (active), recent, or past infection. For example, Borrelia antibodies that persist from a past infection may lead to a false positive result.2 The lack of accurate tests to diagnose early infection can result in delayed or inappropriate treatment that may put the patient at risk for more severe outcomes, including Lyme-associated arthritis, carditis, neurologic complications (such as neuroborreliosis), and possibly post-treatment Lyme disease syndrome, commonly referred to as “chronic Lyme,” for which no specific, approved therapeutic regimen exists. Improved diagnostic assays would increase clinician confidence in initiating appropriate therapy, thus reducing the incidence of adverse outcomes in patients with treatable infections.

Charles Chiu M.D., Ph.D., Professor of Laboratory Medicine and Medicine/Infectious Diseases, Director of the University of California, San Francisco (UCSF) - Abbott Viral Diagnostics and Discovery Center and Associate Director of the UCSF Clinical Microbiology Laboratory at the University of California, San Francisco, was the recipient of a Fiscal Year 2016 Tick-Borne Disease Research Program (TBDRP) award. Dr. Chiu and his team aim to develop assays for the diagnosis of early Lyme disease and other tick-borne infections and the differentiation of Lyme disease from other illnesses with similar clinical presentation. While they are employing multiple approaches to address these gaps in the field of TBDs, Dr. Chiu’s TBDRP-funded award has largely supported efforts concentrated on (1) the identification of a human host molecular biomarker signature that is distinct for Lyme disease, (2) the use of metagenomic sequencing with spiked primer enhancement (MSSPE) to enrich for TBDs from patient samples, and (3) the evaluation of a novel “TickChip” using clustered regulatory interspaced short palindromic repeats (CRISPR)-associated (Cas) gene technology and developed under industrial partnership that would facilitate the simultaneous diagnosis of almost all TBDs.

Toward biomarker identification, Dr. Chiu and his team have generated transcriptomic profiles of whole blood and human peripheral blood mononuclear cells from patients with confirmed Lyme disease, sepsis, influenza, or Babesia infection (the second most common tick-borne disease), as well as age, sex, and geography-matched blood donors. Using machine learning algorithms, a predictive model was constructed that can discriminate between Lyme disease, sepsis, influenza, and controls with 87% accuracy (Figure 1).

more at this link:


https://cdmrp.army.mil/tbdrp/research_highlights/19chiu_highlight#.XhjiecMJsHo.twitter

Many Blessings,
CrystalRiver




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AN EXPLANATION OF THE FACTIONS