It is unusual for this man’s son to have a negative 9/2 day screening test result for nCoV. On February 10, she was screened according to the household category of all VIAGS employees – where her children work. On February 11, she tested positive and transferred to Cu Chi Field Hospital for treatment, low-grade fever.
This woman lives at Nguyen Van Qua Street, Dong Hung Thuan, District 12; is an inspector at GGM Company, Tan Binh Industrial Park.
This positive case has not been recorded by the Ministry of Health, is considered a suspected case. So far, Ho Chi Minh City has recorded 33 cases of infection from Tan Son Nhat epidemic phrase, one case related to Hai Duong, and one suspected case has not been announced by the Ministry of Health.
For the epidemic related to Tan Son Nhat epidemic cluster, F1 negative but F2 positive is the anomaly becomes commonplace, was called an “unexpected situation” by Deputy Minister of Health Nguyen Truong Son. Many cases in the chain of infections from Tan Son Nhat occurred this situation, never seen anywhere else.
In the online meeting on prevention of epidemics of Ho Chi Minh City with Deputy Prime Minister Vu Duc Dam, on the afternoon of February 10, Thu Son assumed the reason why F1 was negative but F2 was positive. Accordingly, it is possible that F1 has been infected, has passed the antigen-positive phase, transmitted to F2. Then F1 recovered and became negative. F2 was detected while in the antigen-positive phase. Or, F1 is the first F0 infecting “patient 1979”, then the F2, but the F1 is cured and negative. From f2, the positive becomes the new F0.
Deputy Minister Son on 11/2 said that the old cycle of nCoV infection was 5-7 days, now related to the translation phrase Tan Son Nhat, the cycle was shortened to only 3-4 days. It is not currently possible to explain why the cycle of nCoV infection is shortened, nor why the abnormality occurs as F2 is positive while F1 is negative. To find the answer, we need to wait for the sequence of the virus gene.
On the afternoon of February 12, according to the Ho Chi Minh City Disease Control Center (HCDC), the results of genetic sequencing of nasopharyngeal fluid samples “patient 1979” and two patients from the loading and unloading team at Tan Son Nhat airport showed that they belong to strain A.23.1 in Rwanda, Africa. The results were reported by the City Hospital for Tropical Diseases and Oxford University Clinical Research Unit (OUCRU) on the same morning.
This is the first time that Vietnam has recorded the appearance of the strain A.23.1 Rwanda, which is also the first time to record this strain in Southeast Asia.
From January 30, Ho Chi Minh City deployed sampling to monitor all staff working at the airport. On 5/2, the city discovered “patient 1979”, staff supervising cargo loading company VIAGS. From this point of case case, from February 7 to 9, the city continued to detect 31 more cases related to the chain of infections at the airport, of which 25 cases were from family members, neighbors .. of the airport staff.
On February 10, through a second surveillance test for 1,600 VIAGS employees, the health sector discovered more cases of infection as “patient 2072”, working in the same department as the previous cases of the company. company VIAGS. Thus, related to the chain of infections at the airport, the city detected 33 cases of infection.
HCDC believes that this is a complicated outbreak because the source of infection has not been determined as well as the starting time. The health sector is investigating and determining the source of transmission.
In recent days, the health sector has traced and zoned emergency cases and places related to patients. Ho Chi Minh City, blockade, test community monitoring by pooled samples of households around where the patient resides. Urgently trace and quarantine contact cases.
On the night of the 30th of Tet, CDC HCMC took 2,146 samples of Covid-19 surveillance tests from motels, workers’ accommodation, 339 samples at big bus stations.
To ensure that passengers arriving and departing at Tan Son Nhat airport, airport staff who come into contact with passengers must test one day prior to the work shift, with nCoV negative results before being allowed to work. From February 11, VIAGS’s staff is allowed to take samples for testing like a group of service staff having contact with passengers at the airport. VIAGS’s team of staff working on loading and unloading goods was transferred to central isolation. About 1,500 households of VIAGS staff were also required to be screened from February 10.
Up to now, Vietnam has recorded 3 strains of nCoV strains, including the British strain that is currently causing epidemics in 13 provinces with the translation center of Hai Duong and Quang Ninh; South African strain in two patients entering isolation immediately, and African Rwanda strain in the chain of transmission at Tan Son Nhat airport, HCMC.