Figure 1From: Public health management of antiviral drugs during the 2009 H1N1 influenza pandemic: a survey of local health departments in California Antiviral challenges reported by Local Health Departments, by time period (n = 44). Proportion of LHDs reporting each antiviral challenge, by time period (April to June 2009 and June 2009 onward). Among those LHDs reporting a challenge, those issues reported to be "very challenging" by 40% or more respondents are marked by an asterisk.Back to article page