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An article published in the BMJ by UK epidemiologists on the ethics of contact tracing apps. Doesn’t ay much - mostly just justifies them on the basis that the reduction in COVID harm far outweighs most privacy concerns.
May be a useful reference, though.
https://jme.bmj.com/content/medethics/early/2020/05/05/medethics-2020-106314.full.pdf
A useful resource for efforts to build an Ethical Model:
https://www.mironov.com/ethics/