As part of a symposium on Covid-19 at Opinio Juris, I contributed a post on the gaps in the legal architecture related to migrants and the global pandemic. You can find it here:
“COVID-19 Symposium: COVID-19 and Migrants–Gaps in the International Legal Architecture?”, https://opiniojuris.org/2020/04/04/covid-19-symposium-covid-19-and-migrants-gaps-in-the-international-legal-architecture/