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Summary of cases with metatranscriptomic pathogen identification and confirmation through PCR assays. (A) Clenched claw syndrome. (B) Black and white bird disease. Blue shading, PCR positive; yellow shading, PCR negative; dark yellow shading, PCR weakly positive; NS, nonsuppurative; CCS, clenched claw syndrome; BWBD, black and white bird disease.
