This weekend, grossing as much as the rest of the top five combined, the virus thriller Contagion opened at number one topping a sluggish frame that saw ticket sales slump to a new low for the year. The Warner Bros. drama scored an estimated $23.1M bow from 3,222 theaters (including 257 higher-priced IMAX screens) for a sturdy $7,180 average playing to a mature adult crowd.