Thumbnail of Monthly distribution of human Streptococcus suis infections in 2 referral hospitals, Vietnam, 2007–2010. Humans infected with S. suis during 2007–2009 are presented as a mean total cases per month. Grey and black bars represent the nmber of S. suis case-patients at the Hospital for Tropical Diseases in Ho Chi Minh City during 2007−2009 and 2010, respectively. Diagonal striped and white bars represent human S. suis cases at the National Hospital for Tropical Diseases in Hanoi during