Assessment of secondary attack rate and effectiveness of antiviral prophylaxis among household contacts in an influenza A(H1N1)v outbreak in Kobe, Japan, May–June 2009 Odaira, F and Takahashi, H and Toyokawa, T and Tsuchihashi, Y and Kodama, T and Yahata, Y and Sunagawa, T and Taniguchi, K and Okabe, N, Eurosurveillance, 14, 19320 (2009), https://doi.org/10.2807/ese.14.35.19320-en