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In a Friday, Sept. 16, 2016 photo, a woman receives a flu vaccine shot, at a community fair in Brownsville, Texas. Vouchers were provided for many participants  at the fair, eliminating the cost associated with the annual vaccination. (Jason Hoekema/The Brownsville Herald via AP)

In a Friday, Sept. 16, 2016 photo, a woman receives a flu vaccine shot, at a community fair in Brownsville, Texas. Vouchers were provided for many participants at the fair, eliminating the cost associated with the annual vaccination. (Jason Hoekema/The Brownsville Herald via AP)