The researchers observed that risky injection practices continued to decrease in persons who Inject drugs (PWID) in places like Haiphong in Vietnam thanks to a high level of awareness of the risks of HIV and HCV infection associated with injection and also to the prescription of methadone treatment. The research team noted that care services for PWID were maintained during the COVID-19 epidemic crisis. No increase in the number of cases of HIV and HCV infection was observed.  In contrast, methamphetamine use by smoking did not decrease despite social distancing measures and more limited access to drugs. Social distancing measures taken to curb the pandemic – including the various lockdowns – also contributed to exacerbating the social situation of the most vulnerable, including PWID and female sex workers.