Cìmìjiē de guǎnkòng cuòshī bǐ mìjiē kuānsōng yīxiē.
Control measures for secondary close contacts are looser than for primary close contacts.
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history
Abbreviation of 次级密切接触者. The term became widely used in China during the 2020–2022 COVID-19 response as part of the 密接 / 次密接 / 时空伴随者 contact-tracing hierarchy.