Covid 19 Delayed testing poor collection of swabs behind false negatives
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MUMBAI: As the second wave of the pandemic intensifies, medical doctors say there’s a group of sufferers who regardless of displaying traditional Covid-19 signs is testing unfavorable for the SARS-CoV-2 virus. The causes vary from poor assortment of swab samples, delayed testing after the looks of the primary signs or variants which have probably modified the illness patterns.
Dr Pratit Samdhani from the state-run JJ Hospital, Byculla, stated there are positively some sufferers who aren’t testing optimistic regardless of having signs reminiscent of fever, cough and physique ache. “If the virus isn’t tested in the third to seventh day after the first symptoms appear, there is a higher chance of false negative,” stated a health care provider with a BMC hospital.
However, not all sufferers are clear about once they began getting signs: some get one-day fever adopted by extreme cough whereas others start with blocked nostril.
Infectious illnesses specialist Dr Om Shrivastava from Jaslok Hospital stated one of many causes for the false unfavorable could possibly be the truth that the RT-PCR check, which is taken into account one of the best to detect the SARS-CoV-2 virus, has a sensitivity between 65 and 70%.
“Tests are not 100% positive, but just because a test is unable to pick up the virus, one cannot exclude the infection. Doctors have to rely on their clinical judgement,” he stated.
At such occasions, medical doctors must rely upon the CT scan of the chest to determine the prognosis. The Covid lung has a particular glassy look that can not be missed, stated Samdhani.

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