In the meantime, here's a very rough chronology of events as reported from various sources including the Cambodian Ministry of Health.
January 8: An 8-month-old boy shows the first symptoms of H5N1 in Chrey Korng village, Phnom Penh. This seems to be part of the metropolitan region, with several good hotels.
January 9: The boy goes to the National Pediatric Hospital. He's tested and confirmed as H5N1 on January 22. He is reported recovered in the January 25 news reports that break the story.
January 11: A 15-year-old girl in Snao village, Takeo province, falls ill. This province is south of Phnom Penh and on the border with Vietnam. I can't find the precise location of the village.
January 13: A 35-year-old man falls ill in Trapeang Sla, Kampong Speu province, west of Phnom Penh.
January 17: 15-year-old girl enters Kantha Bopha Hospital.
January 21: 35-year-old man admitted to Khmer-Soviet Friendship Hospital in Phnom Penh. Samples are taken; he dies soon after. The 15-year-old girl also dies on this day.
January 26: 2-year-old girl in Kampong Speu province, west of Phnom Penh, shows symptoms.
January 28: 2-year-old girl dies in unknown location. So does a 9-year-old girl from Kampot province, south of Phom Penh.
And that is what we know so far. I understand that WHO has rapid response teams working in the regions where these cases appeared, and I hope that Dr. Beat Richner at Kantha Bopha Hospital will post something soon.
Trying to understand the locations of the cases isn't easy. But most are in or near Phnom Penh, at an economically busy time of year—the lunar new year. Poultry is moving in all directions, and it may be that a single sick bird has triggered all these cases.
We should also remember that all these cases were real human beings. The baby boy's family must be grateful that he survived, and the families of the man and the girls are grieving the incredibly unlucky fate of their loved ones, who have died of one of the rarest diseases in the world.