Nosocomial Coronavirus Disease Outbreak Containment, Hanoi, Vietnam, March-April 2020

Area of Science:

• Public Health
• Infectious Disease Epidemiology
• Hospital Outbreak Management

Background:

• Bach Mai Hospital, a major complex in Vietnam, experienced a significant coronavirus disease (COVID-19) outbreak in March 2020.
• The outbreak involved multiple distinct clusters, necessitating a large-scale public health response.
• Initial containment efforts were challenged by the identification of numerous positive cases among hospital staff.

Purpose of the Study:

• To detail the public health response to a COVID-19 outbreak at Bach Mai Hospital.
• To analyze the effectiveness of interventions in controlling hospital-based transmission and community spread.
• To identify key strategies contributing to the containment of the outbreak.

Main Methods:

• Initial case identification and contact tracing of 495 individuals.
• Symptom screening and diagnostic testing for SARS-CoV-2.
• Implementation of targeted quarantine for affected departments and expanded quarantine for the entire hospital staff (7,664 persons).
• Community-wide contact tracing leading to quarantine of over 52,000 individuals.

Main Results:

• Three distinct COVID-19 clusters were identified on March 18.
• A total of 27 catering staff tested positive, triggering a full hospital quarantine.
• The outbreak within the hospital was successfully contained within three weeks.
• No further transmission occurred within Bach Mai Hospital after the implemented measures.

Conclusions:

• Rapid case screening, extensive testing, and prompt quarantine were critical for outbreak control.
• Effective contact tracing and social distancing measures prevented wider community transmission in Hanoi and northern Vietnam.
• The Bach Mai Hospital outbreak response demonstrates the success of a comprehensive public health strategy in managing large-scale infectious disease events within healthcare settings.