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Infection undercount sparks fear, but raises hope of herd immunity

Coronavirus antibody screening faces questions over accuracy and supplies

Air travelers at Jakarta's Halim Perdanakusuma Airport. Indonesia's coronavirus  pandemic is expected to peak in late May.   © Reuters

TOKYO -- The global population may be closer than expected to the critical level of herd immunity needed to reopen business and public activities safely, a recent coronavirus study suggests, but problems with testing make this hard to determine.

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