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. 2010 Oct 4;119(1):78–83. doi: 10.1289/ehp.1002258

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Influenza type B HA RNA in NLF cells. (A) Time course after LAIV inoculation at day 0 (ratio to β-actin). Black line, controls; blue line, SHS exposed; red line, smokers. (B) Relationship between maximum HA RNA during days 1–4 after inoculation and urine cotinine (ratio to creatinine, averaged over days 1–4 after inoculation) for each subject. Black dots, controls; blue dots, SHS exposed; red dots, smokers. Black line indicates linear regression line calculated for all subjects combined (p = 0.01, r² = 0.15).