The study has just been published in the scientific journal Emerging Infectious Disease. That is a cluster of cases involving patient number 91 – British pilot, whose starting point of infection chain is the Buddha shop (District 2 – HCMC).
Study led by Dr. Nguyen Van Vinh Chau, Director of Ho Chi Minh City Hospital for Tropical Diseases, and colleagues from this hospital, Clinical Research Unit – Oxford University (located in HCMC), Disease Children’s Institute 1 (HCMC), Center for Tropical Medicine and Global Health (Oxford, UK), Ho Chi Minh City Center for Disease Control (HCDC).
Hospital for Tropical Diseases of Ho Chi Minh City was the first treatment for patient number 91, one of the central figures of the superinfection event
The study aims to further clarify previous evidence of SARS-CoV-2 transmission in a poorly ventilated, indoor environment. Previously, although the virus was confirmed to be transmitted by inhalation droplets, there is growing evidence that some viral aerosol-type microscopic droplets can remain in the air for a while before landing. surface, leading to a risk of infection if the concentration in the air is dense due to poor ventilation. That’s why experts ask people to open windows, ventilate homes, offices, shops ..
The authors have identified a total of 3 transmission chains originating from a party held on March 14 at the Buddha shop, creating a cluster of 19 patients. Twelve patients agreed to participate in this clinical study and 6 of them had absolutely no symptoms. Up to 3 patients, although there are no symptoms during follow-up, isolation, and treatment, still infect the contact person.
Scientists also sequenced the SARS-CoV-2 genome obtained from 11 patients and found that they were almost identical, tightly assembled but different from the genetic sequence of the cases. Others were recorded in HCMC. This shows that all of these cases come from the same source. Comparing with interviews of 8 patients who agreed to participate, the date was determined.
The publication emphasizes the dangers of indoor and poorly ventilated environments in an effort to repel the Covid-19 pandemic.
Emerging Infectious Disease is an infectious scientific journal of the Center for Disease Control and Prevention (CDC).