We use cookies to understand how you use our site and to improve your experience. This includes personalizing content and advertising. To learn more, click here. By continuing to use our site, you accept our use of cookies. Cookie Policy.

Features Partner Sites Information LinkXpress
Sign In
Advertise with Us
LGC Clinical Diagnostics

Luminex Corporation

Luminex develops, manufactures, and markets biological testing technologies with applications in clinical diagnostics... read more Featured Products: More products

Download Mobile App

Multiplex Immunoassays Enable Quantification of Malaria Antigens

By LabMedica International staff writers
Posted on 16 Jun 2022
Print article
Image: The Q-Plex Human Malaria Array (5-plex) is a robust and fully quantitative chemiluminescent assay for the concurrent surveillance of four malaria biomarkers (Photo courtesy of Quansys Biosciences)
Image: The Q-Plex Human Malaria Array (5-plex) is a robust and fully quantitative chemiluminescent assay for the concurrent surveillance of four malaria biomarkers (Photo courtesy of Quansys Biosciences)

The standard of care for malaria diagnosis is blood smear microscopy and antigen detection through rapid diagnostic test (RDT). Microscopy has limitations in terms of difficulty in identifying mixed infections and RDTs are more amenable for the diagnosis of malaria in settings with limited laboratory infrastructure.

Immunoassay platforms that simultaneously detect malaria antigens including histidine-rich protein 2 (HRP2)/HRP3 and Plasmodium lactate dehydrogenase (pLDH), are useful epidemiological tools for rapid diagnostic test evaluation. The gold standard for malaria detection is confirmation of the presence of parasite DNA or RNA in whole blood by polymerase chain reaction (PCR) testing.

A team of medical scientists led by those at the Diagnostic Group, PATH (Seattle, WA, USA) studied the comparative evaluation of two multiplex platforms in identifying Plasmodium falciparum with presence or absence of HRP2/HRP3 expression as being indicative of hrp2/hrp3 deletions and other Plasmodium species.

The team used a 77-member panel of specimens composed of the World Health Organization (WHO, Geneva, Switzerland) international Plasmodium antigen standards, cultured parasites for P. falciparum and Plasmodium knowlesi, and clinical specimens with mono-infections for P. falciparum, Plasmodium vivax, and Plasmodium malariae was generated as both whole blood and dried blood spot (DBS) specimens.

Assays for HRP2, P. falciparum–specific pLDH (PfLDH), P. vivax–specific pLDH (PvLDH), and all human Plasmodium species Pan malaria pLDH (PanLDH) on the Human Malaria Array Q-Plex (Quansys Biosciences, Logan, UT, USA) and the xMAP platforms (Luminex, Austin, TX, USA) were evaluated with these panels.

The investigators reported that the xMAP showed a higher percent positive agreement for identification of hrp2-deleted P. falciparum and Plasmodium species in whole blood and DBS than the Q-Plex. For whole blood samples, there was a highly positive correlation between the two platforms for PfLDH and PvLDH, moderate positive correlation for HRP2, and poor correlation for PanLDH. The xMAP HRP2 assay appeared to cross-react with HRP3, while the Q-Plex did not. The Q-Plex PfLDH assay cross-reacted with P. malariae, while the xMAP did not. For both platforms, P. knowlesi was detected on the PvLDH assay. The WHO international standards allowed normalization across both platforms on their HRP2, PfLDH, and PvLDH assays in whole blood and DBS.

The authors concluded that Q-Plex and xMAP show good agreement for identification of P. falciparum mutants with hrp2/hrp3 deletions, and other Plasmodium species. Quantitative results from both platforms, normalized into international units for HRP2, PfLDH, and PvLDH, showed good agreement and should allow comparison and analysis of results generated by either platform. The study was published on June 7, 2022 in the Malaria Journal.

Related Links:
Diagnostic Group, PATH 
World Health Organization
Quansys Biosciences 

Platinum Supplier
Xylazine Immunoassay Test
Xylazine ELISA
Gold Supplier
COVID-19 Antigen Self-Test
Panbio COVID-19 Antigen Self-Test
Ferritin Test
M250 Series

Print article


Clinical Chemistry

view channel
Image: The new assays are designed to run on the B•R•A•H•M•S KRYPTOR compact PLUS clinical chemistry analyzer (Photo courtesy of Thermo Fisher)

Breakthrough Immunoassays to Aid in Risk Assessment of Preeclampsia

Preeclampsia is a life-threatening blood pressure condition that can arise during pregnancy and the postpartum phase. This severe pregnancy complication is a primary cause of maternal and fetal mortality... Read more

Molecular Diagnostics

view channel
Image: The ClarityDX Prostate test can reduce unnecessary prostate biopsies by up to 35% (Photo courtesy of Nanostics)

Innovative Blood Test to Revolutionize Prostate Cancer Detection and Reduce Invasive Biopsies

One in six men will receive a prostate cancer diagnosis during their lives. Thankfully, if caught early, prostate cancer is highly treatable. However, the existing screening process has its limitations.... Read more


view channel
Image: The latest FDA clearance has finally brought HemoScreen to its full potential as a true POC hematology analyzer (Photo courtesy of PixCell)

True POC Hematology Analyzer with Direct Capillary Sampling Enhances Ease-of-Use and Testing Throughput

An innovative 5-part differential Complete Blood Count (CBC) analyzer with direct capillary sampling capability significantly simplifies blood sampling and minimizes the pre-analytical process.... Read more


view channel
Image: A new test could detect the body’s adaptive immune response to viruses (Photo courtesy of 123RF)

Predictive T-Cell Test Detects Immune Response to Viruses Even Before Antibodies Form

The adaptive immune system is an incredible defense mechanism that allows the human body to identify and mount targeted responses against specific pathogens. T-Cells, a special kind of white blood cell,... Read more


view channel
Image: The Mitotic Counting algorithm was trained on over 100,000 individual mitosis and across seven scanner models (Photo courtesy of Gestalt Diagnostics)

New AI Algorithm for Use on Eight Types of Cancer Trained on Seven Scanner Models

A new artificial intelligence (AI) algorithm for use on one of the broadest trained environments is now available for commercial or research work. Gestalt Diagnostics (Spokane, WA, USA) has released the... Read more


view channel
Image: A new electrochemical device can quickly and inexpensively identify people at greatest risk for osteoporosis (Photo courtesy of ACS Central Science, 2023)

Electrochemical Device Identifies People at Higher Risk for Osteoporosis Using Single Blood Drop

With the global increase in life expectancy, the incidence of age-related conditions like osteoporosis is increasing. Osteoporosis, affecting around 200 million individuals worldwide, has a higher incidence... Read more


view channel
Image: AACC Middle East is a two-day conference that brings the latest in laboratory medicine to the Middle East region (Photo courtesy of ADLM)

AACC Middle East 2023 to Explore Latest Trends in Clinical Pathology and Laboratory Medicine

The AACC Middle East Conference and Exposition will be held by the Association for Diagnostics & Laboratory Medicine (ADLM - formerly AACC, Washington, DC, USA) in partnership with Life Dx (Abu Dhabi,... Read more
Copyright © 2000-2023 Globetech Media. All rights reserved.