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We experienced two outbreaks of influenza in the respiratory ward of our hospital in Feb. 1990 and Feb. 1993. Influenza-like symptoms were recognized in 42 of 67 cases (63%) in 1990, and in 22 of 56 cases (39%) in 1993. In the former outbreak, the prevalence of the serum CF titer for anti-influenza antibody was elevated in 25 of 42 cases (60%) (only the A2 antibody titer in 2 cases, B antibody titer in 4 cases in the latter one). Among asymptomatic inpatients, the serum titer was elevated in 3 of 25 cases (12%) in the former outbreak, but in 1 of 8 cases which the serum CF titer for anti-influenza antibody was measured in the latter one. A respiratory complications secondary to influenza were observed in 6 (2 cases pneumonia, 3 cases lower respiratory tract infection, 1 case asthma attack) of 67 cases during the former period, but only 1 of 56 cases during the latter period. In the two outbreaks of influenza in the respiratory ward we found the same results concerning the occurrence of influenza-like symptoms, an elevation of the serum antibody titer, but a significant difference was noted with regard to the phenotype of the prevalent influenza and the occurrence of complications.

Comparison of the Prevalence of Symptoms, Elevated Serum Antibody, Antibody Types and Complications between Two Outbreaks of Influenza in a Ward