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. 2002 Jan;8(1):37–43. doi: 10.3201/eid0801.010176

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a. Smoothed mean geometric immunoglobulin (Ig) M antibody titers to Legionella pneumophila of nearest 35 exhibitors in hall 3 and 4 per 63 cm² of exhibition area; confirmed and probable cases among exhibitors in halls 3 and 4. = confirmed case in exhibitor; = probable case in exhibitor; Bu = bubblemat; W = whirlpool spa. b. Smoothed mean geometric IgG antibody titers to L. pneumophila of 35 exhibitors nearest to whirlpool in halls 3 and 4 per 63 cm² of exhibition area; exhibitors ill with confirmed and probable cases in halls 3 and 4. l = confirmed exhibitor case; = probable exhibitor case; Bu = bubblemat; W = whirlpool spa.