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On the night of September 6, the Da Nang Health Department had information on a male SNP (BN) patient (SN 1954, resident of Ngu Hanh Son District, Da Nang City). Consequently, the patient was admitted to Da Nang C Hospital at 6:15 p.m. on September 5 and presented symptoms of fever.
The patient has a history of hypertension, diabetes mellitus, a persistent cough due to chronic obstructive pneumonia, and has been lying in place, not moving, for many years. From June 29 to June 5 to 7, the patient was being treated at Danang Rehabilitation and Orthopedic Hospital. From July 6 to 12, the patient was treated in the geriatrics department of Da Nang Hospital.
From July 13 to August 13, the patient returned home from the hospital. The patient is weak, has atrophy of the leg muscles, so he stays at home. Not going anywhere or interacting with anyone other than family. From August 14 to 18, the patient was hospitalized at C Da Nang Hospital. During this time, patients received oropharyngeal fluid samples taken by Hospital C on August 14 and sent to the CDC for testing and had negative results for SARS-CoV-2.
On the afternoon of August 18-29, the patient returned from the hospital to stay home. On September 5, the patient had a fever and cough, so he went to the emergency room at Da Nang Hospital C. At 7:30 p.m. on September 5, patients received samples from Hospital C and tested Covid-19, on the morning of September 6, with a positive result.
Covid-19 Sampling for People in Da Nang
At 6 o’clock on September 6, Hospital C continued to transfer the samples collected at 7:30 a.m. on September 5 to the Da Nang City Center for Disease Control (CDC) for analysis, the results they were positive. The patient was transferred to the Hoa Vang Field Hospital.
On September 6, the Hoa Vang Field Hospital technician took a sample to perform the test again at 8:45 and the CDC technician (at 9 o’clock) to send to the CDC for the test, the results of tests for both samples. they are negative for SARS-CoV-2 by the RT-PCR method.
On the afternoon of September 6, patients continued to be sampled for antibody tests by the rapid test method and by the Mac Elisa method, the results were positive for antibodies. According to the Da Nang City Health Department, based on these results, the patient’s body had previously been infected with the SARS-CoV2 virus, but now the test results showed that the patient was negative for SARS-CoV- two.
The patient’s family currently has 6 people, including: the patient’s brother, Hospital C did a rapid antibody test and the result was positive. The results of the tests with the RT-PCR method on August 15 were negative; The patient’s wife, also at Hospital C, performed a rapid positive antibody test and a negative PCR test by the RT-PCR method in 5-9 days.
The patient’s daughter is a teacher, the examining officer was tested before the high school exam, the CDC tested September 1-9 using the RT-PCR method, the results were negative. The son-in-law and the two grandsons from the same household rarely interact with the patient. When there was information about the patient testing positive for SARS-CoV-2 at Hospital C, all 6 were transferred to medical isolation at Ngu Hanh Son District Medical Center.
On the afternoon of September 6, the patient’s brother, wife, and daughter’s antibody test results were positive for Mac Elisa, meaning they had been infected with the SARS-CoV-2 virus in the past. The results of the antigen test using the RT-PCR method of 6 family members, the sister-in-law of 1 patient, and 3 other related individuals were negative for SARS-CoV-2.
Sampling for the people of Da Nang
According to the Da Nang City Health Department, the RT-PCT test method for antigens aims to analyze antigens (the pathogen, SARS-CoV-2 virus) that exist in the body and have potential infection in the time of sample collection or not.
The antibody test method is a test method intended to find antibodies. When we have a disease caused by an agent such as a bacterium, a virus, … (antigens), the body produces antibodies in response to that antigen. The antigen test is to determine at the time of the test, whether the body is infected with the antigen or not. An antibody test looks for antibodies, which are produced when the body has received an antigen.
Based on the test results, the Da Nang Health Department said that the patients tested positive for antibodies, that is, in the past, the patient had been infected with the SARS-CoV-2 virus; Currently, the test results show that the patient is negative for SARS-CoV-2 (not infected with the virus).
The Da Nang City Health Department said that this is the case where it is necessary to have more scientific basis and a professional opinion. Da Nang City Health Department will inform the Ministry of Health for professional guidance and direction to handle this case. However, the health sector has implemented anti-epidemic measures in accordance with the regulations; patients are isolated, treated and will continue to collect antigen samples by RT-PCR in the coming days; The health sector also investigated cases of close contact with patients, medical isolation, antigen sampling using the RT-PCT method, all test results were negative for SARS-CoV-2. .
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