Ho Chi Minh City authorities have proposed that the Hospital for Tropical Diseases be allowed to culture the novel coronavirus to better assess herd immunity. To conduct a neutralization reaction, a live virus must be mixed with the serum, Chau stated. At the meeting, a representative from the Ministry of Health stated that the number of COVID-19 cases in Ho Chi Minh City has been decreasing drastically. Ho Chi Minh City authorities have proposed that the Hospital for Tropical Diseases be allowed to culture the novel coronavirus to better assess herd immunity. At the meeting, a representative from the Ministry of Health stated that the number of COVID-19 cases in Ho Chi Minh City has been decreasing drastically.