US smallpox vaccine programme stalls as volunteers balk.
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D000488:Allied Health Personnel / Q000523:psychology*; D001294:Attitude to Health; D023482:Bioterrorism / Q000523:psychology; D006801:Humans; D012900:Smallpox Vaccine / Q000008:administration & dosage*; D016312:Treatment Refusal / Q000523:psychology*; D014481:United States
D012900:Smallpox Vaccine