甚麼是接觸者追踪?

Title from PDF caption (viewed on June 29, 2020)., "OHA 2359A TRADITIONAL CHINESE (05/22/2020).", This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes., Mode of access: Internet from the Oregon Government Publications Collection., Text in Traditional Chinese.
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This archived document is maintained by the State Library of Oregon as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.