THE CORONAVIRUS CRISIS Mystery In Wuhan: Recovered Coronavirus Patients Test Negative ... Then Positive

पुराना गया नहीं एक और कोरोना वायरस चीन के वुहान  शहर में पुन : सिर उठा चुका है। बतलाया जाता है ऐसा वहां २५ मार्च २०२० से आरम्भ हुआ जिसके ब...

पुराना गया नहीं एक और कोरोना वायरस चीन के वुहान  शहर में पुन : सिर उठा चुका है। बतलाया जाता है ऐसा वहां २५ मार्च २०२० से आरम्भ हुआ जिसके बाद से  कई पुराने मरीज़ दोबारा लौट आये हैं।इसी दिन यहां से  लॉकडाउन हटाया गया और अगले ही दिन से 'तू चल मैं आया' का दौर चल निकला। अब तक कुल ३९ नए मामले प्रकाश में आये हैं। दुनिया भर के लिए यह बेहद बुरी खबर है। समझा जाता है यह क्रम अभी इसके बाद भी तीसरे दौर में खुद को दोहराएगा। खुदा खैर करे। 

चीन की खुशफहमी अल्पकाली ही साबित हुई। वायरस अब पहले से ज्यादा घातक होकर लौटा है। बतलाया जाता है यह वायरस पूर्व के सार्स -सीओवी -२ से ज्यादा मारक और खतरनाक है। यह अप्रकट बिना लक्षणों के ही बना रहता है। संक्रमित व्यक्ति को इसका ज़रा भी इल्म नहीं हो पाता। वह अपने अनजाने ही अन्यों को संक्रमित करता रहेगा। पढ़िए पूरी रिपोर्ट जिसे हम कल पुन : समग्रता में पेश करेंगे। फिलवक्त प्रात :के दो बजके सात मिनिट हो चुके हैं। ६ अप्रैल  ने आँखें खोल दी हैं। शुभ प्रभात।  

A spate of mysterious second-time infections is calling into question the accuracy of COVID-19 diagnostic tools even as China prepares to lift quarantine measures to allow residents to leave the epicenter of its outbreak next month. It's also raising concerns of a possible second wave of cases.


From March 18-22, the Chinese city of Wuhan reported no new cases of the virus through domestic transmission — that is, infection passed on from one person to another. The achievement was seen as a turning point in efforts to contain the virus, which has infected more than 80,000 people in China. Wuhan was particularly hard-hit, with more than half of all confirmed cases in the country.
But some Wuhan residents who had tested positive earlier and then recovered from the disease are testing positive for the virus a second time. Based on data from several quarantine facilities in the city, which house patients for further observation after their discharge from hospitals, about 5%-10% of patients pronounced "recovered" have tested positive again.
Some of those who retested positive appear to be asymptomatic carriers — those who carry the virus and are possibly infectious but do not exhibit any of the illness's associated symptoms — suggesting that the outbreak in Wuhan is not close to being over.
NPR has spoken by phone or exchanged text messages with four individuals in Wuhan who are part of this group of individuals testing positive a second time in March. All four said they had been sickened with the virus and tested positive, then were released from medical care in recent weeks after their condition improved and they tested negative.
Two of them are front-line doctors who were sickened after treating patients in their Wuhan hospitals. The other two are Wuhan residents. They all requested anonymity when speaking with NPR because those who have challenged the government's handling of the outbreak have been detained.
One of the Wuhan residents who spoke to NPR exhibited severe symptoms during their first round of illness and was eventually hospitalized. The second resident displayed only mild symptoms at first and was quarantined in one of more than a dozen makeshift treatment centers erected in Wuhan during the peak of the outbreak.
But when both were tested a second time for the coronavirus on Sunday, March 22, as a precondition for seeking medical care for unrelated health issues, they tested positive for the coronavirus even
though they exhibited none of the typical symptoms, such as a fever or dry cough. The time from their recovery and release to the retest ranged from a few days to a few weeks.
Could that second positive test mean a second round of infection? Virologists think it is unlikely that a COVID-19 patient could be re-infected so quickly after recovery but caution that it is too soon to know.
Under its newest COVID-19 prevention guidelines, China does not include in its overall daily count for total and for new cases those who retest positive after being released from medical care. China also does not include asymptomatic cases in case counts.
"I have no idea why the authorities choose not to count [asymptomatic] cases in the official case count. I am baffled," said one of the Wuhan doctors who had a second positive test after recovering.
These four people are now being isolated under medical observation. It is unclear whether they are infectious and why they tested positive after their earlier negative test.
It is possible they were first given a false negative test result, which can happen if the swab used to collect samples of the virus misses bits of the virus. Dr. Li Wenliang, a whistleblowing doctor who later died of the virus himself in February, tested negative for the coronavirus several times before being accurately diagnosed.
In February, Wang Chen, a director at the state-run Chinese Academy of Medical Sciences, estimated that the nucleic acid tests used in China were accurate at identifying positive cases of the coronavirus only 30%-50% of the time.
Another theory is that, because the test amplifies tiny bits of DNA, residual virus from the initial infection could have falsely resulted in that second positive reading.
"There are false positives with these types of tests," Dr. Jeffrey Shaman, a professor of environmental health sciences at Columbia University, told NPR by email. Shaman recently co-authored a modeling study showing that transmission by individuals who did not exhibit any symptoms was a driver of the Wuhan outbreak.
How real is China's recovery?
On Tuesday, Hubei province, where Wuhan is the capital, said it would relax lockdown measures that have now been in place for more than two months and begin letting residents leave cities the following day. Wuhan said it would begin lifting its quarantine measures and letting residents leave two weeks later, on April 8.
To leave Wuhan, residents must first test negative for the coronavirus, according to municipal authorities. Such screenings will identify some remaining asymptomatic virus carriers. But the high rate of false negatives that Chinese doctors have cited means many with the virus could pass undetected.
Last Thursday, Wuhan reported for the first time since the outbreak began that it had no new cases of the virus from the day before — a milestone in China's virus containment efforts. The city reported a zero rise in new cases for the following four days.
Assessing asymptomatic carriers
But Caixin, an independent Chinese news outlet, reported earlier this week that Wuhan hospitals were continuing to see new cases of asymptomatic virus carriers, citing a health official who said he had seen up to a dozen such cases a day.
Responding to inquiries about how the city was counting asymptomatic cases, Wuhan's health commission said Monday that it is quarantining new asymptomatic patients in specialized wards for 14 days. Such patients would be included in new daily case counts if they develop symptoms during that time, authorities said.
"Based on available World Health Organization data, new infections are mainly transmitted by patients who have developed symptoms. Hence [asymptomatic cases] may not be the main source of transmission," the commission said.
A researcher at China's health commission told reporters Tuesday that asymptomatic carriers "would not cause the spread" of the virus. Zunyou Wu, the researcher, explained this was because the authorities were isolating people who had close contact with confirmed patients. Wu did not explain how they would identify asymptomatic carriers who had no close contact with confirmed patients.
Addressing growing public concern of asymptomatic patients, China's Premier Li Keqiang urged during Thursday's senior-level government meeting that "relevant departments must ... truthfully, timely, and openly" answer questions, such as whether these patients are infectious and how the course of the outbreak may change.
Research suggests that the spread can be caused by asymptomatic carriers. Studies of patients from Wuhan and other Chinese cities who were diagnosed early in the outbreak suggest that asymptomatic carriers of the virus can infect those they have close contact with, such as family members.
"In terms of those who retested positive, the official party line is that they have not been proven to be infectious. That is not the same as saying they are not infectious," one of the Wuhan doctors who tested positive twice told NPR. He is now isolated and under medical observation. "If they really are not infectious," the doctor said, "then there would be no need to take them back to the hospitals again."

प्रस्तुति :वीरेंद्र शर्मा ,२४५ /२ ,विक्रम विहार ,शंकर विहार कॉम्प्लकेक्स ,दिल्ली छावनी -११० ०१० 


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Empowerment,1,Workshop,5,World Health Day,1,World no tobacco day,1,world trade center,1,Wormhole concept,1,Ya Perelman,1,yogendra,2,π,1,अंक,1,अंक गणित,1,अंतरिक्ष,1,अंतरिक्ष में सैर सपाटा,1,अंतरिक्ष यात्रा,1,अंतर्राष्ट्रीय सम्मलेन,1,अतिचालकता,1,अतीन्द्रिय दृष्टि,1,अतीन्द्रिय बोध,1,अथर्ववेद,1,अंध-विश्वास,2,अंधविश्‍वास,1,अंधविश्वास को चुनौती,3,अधिक मास,1,अध्यात्म,1,अनंत,1,अनसुलझे रहस्य,1,अन्तरिक्ष पर्यटन,3,अन्धविश्वास,3,अन्धविश्वास के खिलाफ,1,अभिषेक,8,अभिषेक मिश्र,4,अमरता,1,अम्ल वर्षा,1,अयुमु,1,अरुणाचल प्रदेश,1,अर्थ एक्सपेरीमेंट,3,अर्शिया अली,1,अलीगढ़ मुस्लिम युनिवर्सिटी,1,अलौकिक संगीत,1,अवसाद मुक्ति,1,अस्थि विज्ञान,1,आई आई टी,1,आई साईबोर्ग,1,आईएनएस अरिहंत,1,आकाश,1,आकाशगंगा,2,आटिज्‍म,1,आध्यात्म,1,आनंद कुमार,1,आनुवांशिक वाहक,1,आयुष मित्तल,1,आर्कियोलॉजी,1,आलम आरा,1,आविष्कार,1,आविष्कार प्रौद्योगिकी मोबाईल,1,इंटरनेट का सफर,1,इंडिव्हिजुअल व्हेलॉसिटी,1,इनविजिबल मैन,1,इन्जाज़-ऊंट प्रतिकृति,1,इन्द्रधनुष,1,इन्द्रनील भट्टाचार्जी,1,इन्द्रनील भट्टाचार्य,1,इशारों की भाषा,1,ईश्वर और विज्ञान,1,उजाला मासिक,1,उन्माद,1,उन्‍मुक्‍त,1,उप‍लब्धि,3,उबुन्टू,1,उल्‍कापात,1,उल्‍कापिंड,1,ऋग्वेद,1,एड्स जांच दिवस,1,एड्सरोधी क्रीम,1,एनिमल वेलफेयर बोर्ड ऑफ इंडिया,1,एल्कोहल,1,एल्फ्रेड नोबल,1,औरतों में दिल की बीमारी का खतरा,1,कदाचार,1,कपडे,1,कम्‍प्‍यूटर एवं तकनीक,4,कम्प्यूटर विज्ञान,1,करेंट साइंस,1,कर्मवाद,1,किसानों की आत्महत्याएँ,1,कीमती समय,1,कृत्रिम जीवन,1,कृत्रिम रक्‍त,1,कृषि अवशेष,1,केविन वार्विक्क,1,कैसे मजबूत बनाएं हड्डियां,1,क्रायोनिक्स,1,क्रैग वेंटर,1,क्षय मास,1,क्षेत्रीय भाषाओं में विज्ञान कथा लेखन,2,खगोल,1,खगोल विज्ञान,2,खगोल विज्ञान.,1,खगोल वेधशाला,1,खतरनाक व्‍यवहार,1,खाद्य विषाक्‍तता,1,खारा जल,1,खूबसूरत आँखें,1,गणित,3,गति,1,गर्भकाल,1,गर्भस्‍थ शिशु का पोषण,1,गर्मी से बचने के तरीके,1,गुणसूत्र,1,गेलिलियो,1,गोल्डेन नंबर,2,गौरैया,1,ग्रह,1,ग्रीष्मकालीन अयनांत,1,ग्रुप व्हेलॉसिटी,1,ग्रेफ़ाइट,1,ग्लोबल वार्मिंग,2,घाघ-भड्डरी,1,चंद्रग्रहण,1,चमत्कार,1,चमत्कारिक पत्थर,1,चरघातांकी संख्याएं,1,चार्ल्‍स डार्विन,1,चिकत्सा विज्ञान,1,चैटिंग,1,छरहरी काया,1,छुद्रग्रह,1,जल ही जीवन है,1,जान जेम्स 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ब्लॉगर्स,1,नेत्रदान का महत्‍व,1,नेत्रदान कैसे करें?,1,नैनो टेक्नालॉजी,1,नॉटिलस,1,नोबल पुरस्कार,1,नोबेल पुरस्कार,2,न्‍यूटन,1,परमाणु पनडुब्‍बी,1,परासरण विधि,1,पर्यावरण और हम,1,पर्यावरण चेतना,2,पशु पक्षी व्यवहार,1,पहली बारिश,1,पाई दिवस,1,पुच्‍छल तारा,1,पुरुष -स्त्री लिंग अनुपात,1,पूर्ण अँधियारा चंद्रग्रहण,1,पृथ्वी की परिधि,3,पृथ्‍वेतर जीवन,1,पेट्रोल चोरी,1,पेंसिल,1,पैडल वाली पनडुब्बी,1,पैराशूट,1,पॉवर कट से राहत,1,पौरूष शक्ति,1,प्रकाश,2,प्रज्ञाएँ,1,प्रतिपदार्थ,1,प्रतिरक्षा,1,प्रदूषण,1,प्रदूषण और आम आदमी,1,प्ररेणा प्रसंग,1,प्रलय,2,प्रलय का दावा बेटुल्गुयेज,1,प्रसव पीड़ा,1,प्रेम में ।धोखा,1,प्रोटीन माया,1,प्लास्टिक कचरा,1,फाई दिवस,1,फिबोनाकी श्रेणी,1,फिबोनाची,1,फेसबुक,1,फ्रीवेयर,1,फ्रेंकेंस्टाइन,1,फ्रेंच किसिंग,1,बनारस,1,बायो-क्रेमेशन,1,बायोमैट्रिक पहचान तकनीकियाँ,2,बाल विज्ञान कथा,1,बालसुब्रमण्यम,6,बिग-बेंग सिद्धांत,1,बिजली,1,बिजली उत्‍पादन,1,बिजली कैसे बनती है?,1,बिजलीघर,1,बिली का विकल्‍प,1,बी0एम0डब्ल्यू0,1,बीरबल साहनी,1,बुलेटप्रूफ,1,बैल चालित पम्प,1,ब्रह्मण्‍ड,1,ब्रह्मा,1,ब्रह्माण्‍ड,1,ब्रह्माण्‍ड के रहस्‍य,1,ब्रह्मान्ड,1,ब्रेन म्‍यूजिक,1,ब्लॉग लेखन,1,ब्लॉग लेखन के द्वारा विज्ञान संचार,2,ब्लॉगिंग का महत्व,1,भारतीय आयुर्विज्ञान अनुसंधान परिषद,1,भारतीय विज्ञान कथा लेखक समिति,1,भारतीय वैज्ञानिक,2,भारतीय शोध,1,भूकंप के झटके,1,भूकम्‍प,1,भूगर्भिक हलचलें,1,मंगल,1,मधुमेह और खानपान,1,मनजीत सिंह बोपाराय,1,मनीष मोहन गोरे,1,मनीष वैद्य,1,मनु स्मृति,1,मनोरंजक गणित,1,महिला दिवस,1,माचू-पिचू,1,मानव शरीर,1,माया,1,मारिजुआना,1,मासिक धर्म,1,मिल्‍की वे,1,मिशन स्टारडस्ट-नेक्स,1,मीठी गपशप,1,मीमांसा,1,मुख कैंसर,1,मृत सागर,1,मेघ राज मित्र,1,मेडिकल रिसर्च,1,मेरी शैली,1,मैथेमेटिक्स ओलम्पियाड,1,मैरी क्‍यूरी,2,मैरीन इनोवेटिव टेक्नोलॉजीज लि,1,मोटापा,1,मोबाईल के नुकसान,1,मौसम,1,यजुर्वेद,1,युवा अनुसंधानकर्ता पुरष्कार,1,यूरी गागरिन,1,योगेन्द्र पाल,1,योगेश,1,योगेश रे,1,रक्षा उपकरण,1,राईबोसोम,1,रूप गठन,1,रेडियो टोमोग्राफिक इमेजिंग,1,रैबीज,1,रोचक रोमांचक अंटार्कटिका,4,रोबोटिक्स,1,लखनऊ,1,लादेन,1,लालन-पालन,1,लिनक्स,1,लिपरेशी,1,लीप इयर,1,लेड,1,लॉ ऑफ ग्रेविटी,1,लोक विज्ञान,1,लौह स्तम्भ,1,वजन घटाने का आसान तरीका,1,वाई गुणसूत्र,1,वायु प्रदुषण,1,वाशो,1,विज्ञान,1,विज्ञान कथा,3,विज्ञान कथा सम्मेलन,1,विज्ञान के खेल,2,विज्ञान चुटकले,1,विज्ञान तथा प्रौद्यौगिकी,1,विज्ञान प्रगति,1,विज्ञान ब्लॉग,1,विज्ञापन,1,विटामिनों के वहम,1,विद्युत,1,विवेकानंद,1,विवेचना-व्याख्या,1,विश्व नि-तम्बाकू दिवस,1,विश्व पर्यावरण दिवस,1,विश्व भूगर्भ जल दिवस,1,विष्णु,1,वीडियो,1,वीडियो बुक,1,वैज्ञानिक दृष्टिकोण,1,वैद्य अश्विनी कुमार,1,वोस्तोक,1,व्‍यायाम के लाभ,1,व्हेलॉसिटी,1,शिव,1,शुक्र पारगमन,1,शुगर के दुष्‍प्रभाव,1,शून्य,1,शोध परिणाम,1,शोधन,1,श्रृष्टि का अंत,1,सं. राष्ट्रसंघ,1,सकारात्‍मक सोच का जादू,1,संक्रमण,1,संख्या,1,संजय ग्रोवर,1,संज्ञात्मक पक्षी विज्ञान,1,सटीक व्‍यायाम,1,संत बलबीर सिंह सीचेवाल,1,सत्यजित रे,1,समय की बरबादी को रोचकने के उपाय,1,समाज और हम,1,समुद्र,1,संयोग,1,सर चन्द्रशेखर वेंकट रमन राष्ट्रीय विज्ञान दिवस,1,सर्प संसार,1,साइकोलोजिस्ट,1,साइनस उपचार,1,साइंस ब्लागर्स मीट,1,साइंस ब्लागर्स मीट.,2,साइंस ब्लॉग कार्यशाला,2,साइंस ब्लॉगर्स असोसिएशन अवार्ड,1,साइंस ब्लॉगर्स असोसिएशन रजिस्ट्रेशन,1,साइंस ब्लॉगर्स ऑफ दि ईयर अवार्ड,1,साइंस ब्लोगिंग,1,साईकिल,1,सामवेद,1,सामाजिक अभिशाप,1,सामाजिक चेतना,1,साहित्यिक चोरी,2,सिगरेट छोड़ें,1,सी. एस. आई. आर.,1,सी.वी.रमण विज्ञान क्लब,1,सीजेरियन ऑपरेशन,1,सुपर अर्थ,1,सुपर कम्प्यूटर,1,सुरक्षित ब्लॉगिंग,1,सूर्यग्रहण,2,सृष्टि व जीवन,3,सेक्स रेशियो,1,सेहत की देखभाल,1,सोशल नेटवर्किंग,1,स्टीफेन हाकिंग,1,स्पेन,1,स्मृति,1,स्वर्ण अनुपात,1,स्वाईन-फ्लू,1,स्वास्थ्य,2,स्‍वास्‍थ्‍य और खानपान,1,स्वास्थ्य चेतना,3,हमारे वैज्ञानिक,4,हरित क्रांति,1,हंसी के फायदे,1,हाथरस कार्यशाला,1,हिंद महासागर,1,हृदय रोग,1,होलिका दहन,1,ह्यूमन रोबोट,1,
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Science Bloggers' Association: THE CORONAVIRUS CRISIS Mystery In Wuhan: Recovered Coronavirus Patients Test Negative ... Then Positive
THE CORONAVIRUS CRISIS Mystery In Wuhan: Recovered Coronavirus Patients Test Negative ... Then Positive
Science Bloggers' Association
https://blog.scientificworld.in/2020/04/the-coronavirus-crisis-mystery-in-wuhan.html
https://blog.scientificworld.in/
https://blog.scientificworld.in/
https://blog.scientificworld.in/2020/04/the-coronavirus-crisis-mystery-in-wuhan.html
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