Abstract: Some embodiments are directed to retrofitting apparatus for use with a chair, the chair including a seat portion, a back portion that extends substantially perpendicular to the seat portion, and at least one elongated connector that connects the seat portion and the back portion. The retrofitting apparatus includes a removable coupling structure connectable to the at least one elongated connector of the chair, the removable coupling structure including at least one connecting member configured to extend around a perimeter of a portion of the at least one elongated connector; and a cover connected to the coupling structure, the cover configured to project from at least a180 degree radius around at least a portion of the back portion of the chair, thereby extending around sides of a chair occupant so as to provide a physical barrier between the chair occupant and those disposed adjacent thereto.