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. Author manuscript; available in PMC: 2017 Mar 8.
Published in final edited form as: Vaccine. 2016 Feb 6;34(11):1363–1369. doi: 10.1016/j.vaccine.2016.01.051

Fig. 1.

Fig. 1

HI titers to A/California/07/2009 (H1N1), A/Victoria/210/2009, (H3N2) and B/Brisbane/60/2008 at baseline and 4 weeks after TIV administration to opioid users and non-drug users controls. Lines connect data points from each individual.