Features | Partner Sites | Information | LinkXpress
Sign In
FOCUS DIAGNOSTICS, INC.
GLOBETECH PUBLISHING LLC
RANDOX LABORATORIES

Cutaneous Leishmaniasis Diagnosed by Press Imprint Smear

By Labmedica International staff writers
Posted on 28 Aug 2014
Image: Leishmania amastigotes from a smear of a patient with cutaneous leishmaniasis (Photo courtesy of University of California, Los Angeles).
Image: Leishmania amastigotes from a smear of a patient with cutaneous leishmaniasis (Photo courtesy of University of California, Los Angeles).
The diagnostic method of choice for cutaneous leishmaniasis historically has been microscopic demonstration of the parasite and isolation of the protozoa in culture and detection of parasite DNA by molecular diagnostic methods.

However most cases of cutaneous leishmaniasis occur in areas without good health infrastructure where diagnostic laboratory facilities are limited, therefore a rapid, sensitive, and inexpensive test for the diagnosis of the disease is needed for use in rural, resource-limited, endemic settings.

Scientists at the Federal University of Ceará (Fortaleza, Brazil) collected skin biopsy samples from 75 patients with a clinical diagnosis of cutaneous leishmaniasis, from September 2011 to August 2013. Two biopsy samples were taken from the borders of ulcers (lesions) using a 3-mm disposable punch. One biopsy specimen was fixed in 10% formalin and processed for histopathology and the other specimen was used for a Press-Imprint-Smear.

For the imprint, the biopsy sample was put on a glass slide, and another glass slide was used to cover the tissue fragment sandwiched in between. On a firm surface, the tissue fragment between both glass slides was squeezed or squashed. Pressure on the middle of the slides was made, and therefore, the juice and tissue cells were spread on both slides surfaces that were in contact with the sample. Smears were air dried, fixed in methanol, stained with Giemsa, and examined microscopically using a 100 × oil immersion lens.

In 69 (92%) patients, the diagnosis of cutaneous leishmaniasis was confirmed by the identification of amastigotes by one or both methods. In 64 (85.3%) patients, amastigotes were detected by Press-Imprint-Smear. In 33 (44%) patients, amastigotes were detected by histopathology, and in 28 (37.3%) patients, amastigotes were detected by both methods. In 36 (48%) patients, parasites were seen only by Press-Imprint-Smear, and in five (6.7%) patients, parasites were seen only by histopathology. Leishmania (Viannia) braziliensis was the only species in this area.

The authors concluded that the Press-Imprint-Smear method was quicker that the histological method as it only took about an hour and had a much higher sensitivity of 85.3% compared with histology at 44%. Considering its sensitivity, low cost, and simplicity, Press-Imprint-Smear is a valuable tool for diagnosing cutaneous leishmaniasis and potentially, other infectious diseases at the point of care in rural or resource-limited endemic regions. The study was published on August 11, 2014, in the American Journal of Tropical Medicine and Hygiene.

Related Links:

Federal University of Ceará



KARL HECHT GMBH & CO KG
DIASYS DIAGNOSTIC SYSTEMS
77 ELEKTRONIKA

Channels

Genetic Tests

view channel

Padlock Probe Assay Rapidly Detects Cardiac Disease Gene Mutations

A recent paper described a novel next generation sequencing (NGS) assay for detecting cardiac disease gene mutations with improved accuracy, flexibility, turnaround time, and cost. By using double-stranded DNA probes (complementary long "padlock" probes or cLPPs), investigators at Stanford University (Palo Alto, CA,... Read more

Hematology

view channel
Image: Immunochemistry of bone marrow biopsy from an acute myeloid leukemia patient showing sheets of CD34 positive cells; corresponding bone marrow aspirate showed only 20% blasts (Photo courtesy of All India Institute of Medical Sciences).

Immunohistochemistry Assesses Early Response in Acute Myeloid Leukemia

Acute myeloid leukemia (AML) is a heterogeneous disease with respect to prognosis and early response assessment has an established role as predictor of remission rate, and overall and disease-free survival.... Read more

Industry News

view channel

Distribution Agreement to Improve Automated Hemostasis Diagnostics

A new, exclusive-distributer agreement will lead to creating a unique high-performance hemostatis work cell by connecting a laboratory automation system (LAS) from Thermo Fisher Scientific (Waltham, MA, USA) with a hemostasis testing LAS from Instrumentation Laboratory (IL; Bedford, MA, USA). The agreement between IL... Read more
 
Copyright © 2000-2015 Globetech Media. All rights reserved.