Click through to the Kantha Bopha Hospitals website, and then click on "Kantha Bopha in September 2012." Dr. Beat Richner has posted a PDF on the statistics for his hospitals. Some of those numbers:
September admissions for severe hemorrhagic dengue fever (HDF) at Kantha Bopha in Phnom Penh: 1,532.
September admissions for severe HDF at Kantha Bopha III in Siem Reap Angkor: 1,632.
Admissions to both hospitals for severe HDF from January 1 to September 30: 24,199.