Ronnie Dunn’s severe respiratory condition has forced country duo Brooks & Dunn to cancel and postpone three consecutive shows — September 11 at the York County Fair in York, PA; September 12 in Pittsburgh, PA; and September 13 in Chicago, IL.

The group’s concerts with ZZ Top and special guest Rodney Atkins in Pittsburgh and Chicago have been rescheduled with back-to-back shows: The Pittsburgh concert is now October 15; the Chicago gig is October 16.

On their Web site, Dunn was quoted in a statement: “I’m sitting here sick, pretty bummed out, with no voice.”

Ticketholders to the postponed Pittsburgh and Chicago shows can use their tickets for the rescheduled concerts. Previously selected Meet & Greet guests will also be honored on the rescheduled dates. The York County Fair tickets can be refunded at the point of purchase.

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The September 13 show was previously the final scheduled concert featuring Brooks & Dunn along with ZZ Top before the two continued on separate tours. Brooks & Dunn, already multiple-award winners, were recently nominated for two Country Music Association awards — Album of the Year and Duo of the Year.