This is an academic paper that provides a review of public health messaging related to harm reduction, and calls for these services as being essential during the coronavirus pandemic. The reference list has 60 reports and papers related to the intersection of the opioid crisis and the pandemic.
Wilkinson, R., Hines, L., Holland, A., Mandal, S., Phipps, E. (2020). Rapid evidence review of harm reduction interventions and messaging for people who inject drugs during pandemic events: implications for the ongoing COVID-19 response. Harm Reduction Journal, 17(1), 95.