The patients has been seen with negative antibody test to covid-19. Is atypical presentation with negative antibody test to covid-19 exclude the disease.
- Negative results do not rule out SARS-CoV-2 infection, particularly in those who have been in contact with the virus. Follow-up testing with a molecular diagnostic assay (nasal swab) should be considered to rule out infection in these individuals.
- Results from antibody testing should not be used as the sole basis to diagnose or exclude SARS-CoV-2 infection or to inform infection status.
- Positive results may be due to past or present infection with non-SARS-CoV-2 coronavirus strains, such as coronavirus HKU1, NL63, OC43, or 229E
No, antibody might not been produced yet by our body. It takes some time to produce IgM and IgG after we got infected by the virus.
Antibody tests are to be used only for disease surveillance purpose. They are a marker of previous exposure to COVID- 19 and cannot be used for diagnostic purpose.
Yes I agree with Aroop Mohanty. Antibody will take some time to appear after the infection.
We do not know how long IgM or IgG antibodies to SARS-CoV-2 will remain present in the body after the infection has been cleared.Antibodies may not be present in detectable levels in early days of an infection.
I saw Spain uses antibody test the following way: If you are positive only with IgG than you have passed the infection a time ago. If you are positive with IgG and IgM than you have passed the infection a very short time ago. If you are positive only with IgM than it is possible you are still an active case. Problem: positive IgM sometimes ocure in the 2nd weeks after the infection, sometimes it take even more time. So a negative/negative can nor rule out a recent infection.
Yes i agree that antibodies will remain present in covid recoverd patients that boost up immunity
Thank you prof. Yau, Mohanty, Parande, Joseph, Ziemendorff and Amjad
Combined with the Nasal Swab by RT-qPCR, the COVID-19 Serological Antibody Blood Test offers a valuable diagnostic tool in identifying infected patients. According to recent studies, the COVID-19 antibodies are not detectable before 3 days after onset of symptoms (or at least 7 to 10 days after infection). However, antibody tests can detect past infection because virus-specific antibodies can persist in the blood for several weeks/months after the onset of symptoms. Since the exact time of infection is often unknown
- Negative results do not rule out SARS-CoV-2 infection, particularly in those who have been in contact with the virus. Follow-up testing with a molecular diagnostic assay (nasal swab) should be considered to rule out infection in these individuals.
- Results from antibody testing should not be used as the sole basis to diagnose or exclude SARS-CoV-2 infection or to inform infection status.
- Positive results may be due to past or present infection with non-SARS-CoV-2 coronavirus strains, such as coronavirus HKU1, NL63, OC43, or 229E
COVID19 sample test and a others tests ever showed negative antibody test.
It depends additionally on the Specificity of the test. Here in Peru I saw tests in a range from 92% to 98%, that means that from 2% to 8% there are false negatives, even if you already have antibodies.
RT-PCR is the only gold standard one to confirm. Even it has limitations too.
Yes,From medical reports sometimes negative antibody results so question how Balanced and answer is for this COVID19 syndrome ,diabetes problem and hypertension are common causes of death maximum for aged patients.
I think it is apparently seen or wrong procedure of diagnosing and if it is negative antibody then that patient or person not in safe.
Results from antibody testing should not be used as the sole basis to diagnose or exclude SARS-CoV-2 infection or to inform infection status
Accorded with Mr Gamal Hamad.
Negative or less which is not normal exclude the COVID 19
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