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The Epidemic Central Command Center stated today (7) that China has recently received notifications from Japanese and French officials through the IHR National Focal Point (IHR National Focal Point). People who have entered Japan and France from China have tested positive for COVID-19. .
The command center noted that Japan reported a total of 3 positive cases, one of which was of nationality (Case 1) and two of them were of Japanese nationality (Case 2, Case 3), all male, aged between 50 and 60 years. Case 1 was asymptomatic and the test results were negative within 3 days before leaving Taiwan (September 30), and the antigen was positive upon entering Japan on October 2; case 2 was asymptomatic, except that the antigen was positive when entering Japan on October 2, The results of the nucleic acid tests performed on October 3 and 5, respectively, were negative; Case 3 was a crew member leaving the Philippine port in July. The case developed chest pain on September 17, and was sent to the hospital and admitted to the port of China on September 18. He was hospitalized and went to the epidemic prevention hotel for quarantine from September 25 to October 2. The period was certainly symptomatic. The antigen was positive when I entered Japan on October 3, and the nucleic acid test was negative again on October 4. A total of 74 people who had contacts in Taiwan of the 3 cases were listed, and 34 should be tested. Nucleic acid and serum antibody tests were all negative.
The command center stated that a total of 1 positive cases were detected in France, a Frenchman in his 20s. It entered China in February this year and left China on September 30. The inspection was carried out when it entered France on October 1 and was inspected on October 2. The nucleic acid is positive. The case has been asymptomatic during the period from Taiwan to departure. The health unit has listed a total of 9 case contacts during the period in Taiwan, of which 3 were tested, and the nucleic acid and serum antibodies were all negative.
Chen Shizhong, commander of the Epidemic Central Command Center, claimed that case 469 was a Belgian national. In March he had symptoms. The case has been listed as unknown. It took a long time to get tested when he was heading abroad in late July. The trial was available in China for up to 81 days. Case 518 was found in the Philippines and local treatment was negative. After a while, the 10/3 test came back positive. Recently, more and more cases of this type have been found. Experts believe that the infectious power will gradually decrease after the onset of the disease. They remind the Chinese to wear masks. , Wash your hands frequently.
For this trip from Taiwan to Japan, 3 people tested positive. Chen Shizhong believes that this shows that there are situations where there are such different tests, just like case 1 has no symptoms and case 2 has no symptoms. The antigen was positive when it entered Japan on October 2, but the PCR was negative on October 3 and October 5. .
Regarding the frequent cases of exports from Taiwan, Chen Shizhong said that the time spent with France is small, so the situation is unclear, but in general, the relevant inspections are inconsistent, and countries will have different quarantine measures depending on different methods. Further understanding is required to clarify, but all cases are treated as local cases, and an investigation of the epidemic from the contact history in Taiwan will be conducted.
Japan tests positive for antigen, but nucleic acid test is negative. Does that mean that Japan is prone to false negatives and false positives when antigens are used for testing? Zhang Shangchun, the coordinator of the expert group, said that antigen sensitivity will definitely not be ideal. Rapid influenza detection has been used for many years and the sensitivity is only 60% to 70%. Judging from the new coronary pneumonia, the sensitivity will not exceed 80% or 90%. I think it is good to be sensitive and specific, but the expert team in Taiwan has reservations about this. We were tested positive in Japan before, but repeat PCR tests were all negative a week later. Therefore, we believe that there is a high probability of false positives. The few members argue that it is a false positive.
(Zhongshi News Network)
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