The dengue antigen NS1, IgG & IgM test measures the dengue virus or antibodies which are produced in response to dengue infection. Dengue fever is a viral infection which is transmitted to humans by mosquitoes which live in tropical and subtropical climates and are responsible for carrying the virus.
When does IgM dengue becomes positive?
Dengue virus-specific IgM and neutralizing antibodies typically develop toward the end of the first week of illness. IgM levels are variable, but generally are positive starting 4-5 days after onset of symptoms and continuing for approximately 12 weeks post symptom onset, but may persist longer.
What does dengue IgM positive mean?
Positive IgM and IgG tests for Dengue antibodies detected in a sample means that the patient became infected with dengue virus within recent weeks.
What does positive IgG and IgM mean?
What does it mean if the specimen tests positive for IgM and/or IgG antibodies against virus that causes COVID-19? A positive test result with the qSARS-CoV-2 IgG/IgM Rapid Test indicates that antibodies to SARS-CoV-2 were detected, and the patient has potentially been exposed to COVID-19.
Does NS1 positive means dengue?
A positive NS1 test result confirms dengue virus infection without providing serotype information. A negative NS1 test result does not rule out infection. People with negative NS1 results should be tested for the presence of dengue IgM antibodies to determine possible recent dengue exposure.
What is difference between dengue NS1 and IgM?
NS1 antigen is generally found during Day 1 and up to Day 9 after onset of fever. The detection of anti-NS1 is inhibited if anti-NS1 antibodies produced. Whereas IgM become detectable by Day 3 to Day 5 after onset of illness in primary dengue and by Day 1 to Day 2 after onset of illness in secondary infections.
What is NS1 in dengue?
NS1 tests detect the non-structural protein NS1 of dengue virus. This protein is secreted into the blood during dengue infection. NS1 tests have been developed for use in serum. Most of these tests use synthetically labeled antibodies to detect dengue NS1 protein.
What if dengue IgG is positive and IgM negative?
Positive IgM and IgG tests for dengue antibodies detected in an initial blood sample mean that it is likely that the person became infected with dengue virus within recent weeks. If the IgG is positive but the IgM is low or negative, then it is likely that the person had an infection sometime in the past.
How do you read IgG and IgM results?
For Rapid antibody tests and ELISA tests the interpretation is the same….IgM positive, IgG negative:
- This suggests infection in the early stages of the disease.
- The patient is infectious.
- If the result does not coincide with the clinical picture (for example, if there are no symptoms) it could be a false positive.
What is dengue IgG positive IgM negative?
What is the dengue antigen NS1 IgG & IgM test?
The dengue antigen NS1, IgG & IgM test measures the dengue virus or antibodies which are produced in response to dengue infection. Dengue fever is a viral infection which is transmitted to humans by mosquitoes which live in tropical and subtropical climates and are responsible for carrying the virus.
Is IgG positive dengue test reliable?
Presence of IgG alone (absence of NS1 Ag and/or IgM), does not indicate active dengue infection. Test results, therefore, should be used in conjunction with clinical evaluation, including exposure history and clinical symptoms. Among the two antibodies, IgG is a less reliable marker in the diagnosis of Dengue infection.
What does a negative NS1 test result mean?
Interpretation of results A positive NS1 test result confirms dengue virus infection without providing serotype information. A negative NS1 test result does not rule out infection. People with negative NS1 results should be tested for the presence of dengue IgM antibodies to determine possible recent dengue exposure.
What does a negative Prnt result mean for dengue?
These results are classified as recent flavivirus infection. Cases may be re-classified as another flavivirus, such as Zika, according to PRNT results. A negative PRNT result on a dengue IgM positive sample indicates a false positive result, indicating no evidence of infection.
