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Influenza and RSV activity in the community, and hospitalisation for lower respiratory tract infection (LRTI) in the elderly. Horizontal bars show the RSV (black) and influenza (grey) activity in the community for the winter of 1997–1998 documented by the national surveillance system for acute respiratory tract infections in Belgium. Vertical bars show the weekly study inclusions with LRTI; a black top represents the LRTI caused by RSV and a grey top those caused by influenza
