In an effort to minimize the effects of the flu virus, the Danbury Department of Health and Human Services has scheduled standing office hours to deliver the flu vaccine.  The clinics will be held in City Hall on Tuesday and Thursday evenings from 4 to 6, for the month of February.  The Department is offering various flu vaccinations for persons 6 months and older.  There's a 0-dollar copay with most insurance companies. Uninsured children under 18 years of age can get a free flu shot.  It is the patient’s responsibility to pay any balance of the vaccination fee if their respective insurance company does not cover it.  Quadrivalent is $25, a high-dose, recommended for seniors, is $65, and Flublok: $65.  Department officials say they reserve the right to bill any patient whose insurance does not fully cover the cost of the vaccination.