Figure 1: Seasonal trend of RSV related pediatric ARI hospitalizations in Nha Trang, Khanh Hoa province during January 2010–December 2012.

Each box corresponds to the cumulative pediatric ARI cases in each month during the study period from January 2010 to December 2012. RED-filled boxes correspond to the RSV subgroup-A ARI cases, and BLUE-filled boxes are for the RSV subgroup-B ARI cases. RSV subgroup unclassified ARI cases were added on top of the BLUE-filled boxes as GREEN-filled boxes. Lower respiratory tract infection (LRTI) in each month was indicated as the BLUE solid line. *ARI is abbreviation for “Acute Respiratory Infection”. *LRTI is abbreviation for “lower respiratory tract infection”.