About
Typhoid fever is caused by S. typhi, a Gram-negative bacterium. Worldwide an estimated 17 million cases and 600,000 associated deaths occur annually. Patients who are infected with HIV are at significantly increased risk of clinical infection with S. typhi. Evidence of H. pylori infection also presents an increased risk of acquiring typhoid fever. 1-5% of patients become chronic carrier harboring S. typhi in the gall bladder. The clinical diagnosis of typhoid fever depends on the isolation of S. typhi from blood, bone marrow or a specific anatomic lesion. In the facilities that can not afford to perform this complicated and time-consuming procedure, Filix-Widal test is used to facilitate the diagnosis. However, many limitations lead to difficulties in the interpretation of the Widal test. In contrast, the Typhoid IgG/IgM Rapid Test is a simple and rapid laboratory test. The test simultaneously detects and differentiates the IgG and the IgM antibodies to S. typhi specific antigen thus to aid in the determination of current or previous exposure to the S. typhi.
Specification
PRINCIPLE
The Typhoid IgG/IgM Rapid Test is a lateral flow immunochromatographic assay. The test cassette consists of: 1) a pink-purple colored conjugate pad containing recombinant S. typhi H antigen and O antigen conjugated with colloid gold (Typhoid conjugates) and rabbit IgG-gold conjugates, 2) a nitrocellulose membrane strip containing two test region (Test line M and G) and a control region (control line). The test line ‘M’ is pre-coated with monoclonal anti-human IgM for the detection of IgM anti-S. typhi, test line
‘G’ is pre-coated with monoclonal anti-human IgG for the detection of IgG anti-S. typhi , and the C band is pre-coated with goat anti rabbit IgG. When an adequate volume of test specimen is dispensed into the sample well of the cassette, the test specimen migrates by capillary action across the test cassette. Anti-S. typhi IgM if present in the patient specimen will bind to the Typhoid conjugates. The immunocomplex is then captured on the membrane by the pre-coated anti-human IgM antibody at test region
‘M’, forming a pink-purple line at ‘M’ region, indicating a S. typhi IgM positive test result.
Anti-S. typhi IgG if present in the patient specimen will bind to the Typhoid conjugates. The immunocomplex is then captured by the pre-coated reagents on the membrane, forming a pink-purple line at test region ‘G’, indicating a S. typhi IgG positive test result. Absence of any pink-purple line at test region (M and G) suggests a negative result. The test contains an internal control (control line) which should exhibit a pink-purple line of the immunocomplex of goat anti rabbit IgG/rabbit IgG-gold conjugate
regardless of the color development on any of the test region. Otherwise, the test result is invalid and the specimen must be retested with another device.
Direction for Use
Plasma
1. Collect blood specimen into a lavender, blue or green top collection
tube (containing EDTA, citrate or heparin, respectively in
Vacutainer® ) by veinpuncture.
2. Separate the plasma by centrifugation.
3. Carefully withdraw the plasma into new pre-labeled tube.
Serum
1. Collect blood specimen into a red top collection tube (containing no
anticoagulants in Vacutainer®) by veinpuncture.
2. Allow the blood to clot.
3. Separate the serum by centrifugation.
4. Carefully withdraw the serum into a new pre-labeled tube.
Test the specimens as soon as possible after collecting. Store specimens
at 2-8°C if not tested immediately.
Store specimens at 2-8°C up to 5 days. The specimens should be frozen
at -20°C for longer storage.
Avoid multiple freeze-thaw cycles. Prior to testing, bring frozen specimens
to room temperature slowly and mix gently. Specimens containing visible
particulate matter should be clarified by centrifugation before testing. Do
not use samples demonstrating gross lipemia, gross hemolysis or turbidity
in order to avoid interference on result interpretation.
Other Info
STORAGE AND STABILITY
Typhoid IgG/IgM test card should be stored at 4-40°C. The card may be stored at room temperature but not exceeding 40°C in the original sealed pouch. The shelf life or expiry of the card is printed on Pouch as well as carton label. The test kit should be kept away from direct sunlight, moisture and heat.
Dr. S S Khan –
For typhoid testing