The WHO's Krishnan said health teams have monitored the condition of people who came in contact with the victims, adding that all had tested negative for the virus. The government has also boosted the number of television and radio spots warning of avian flu and telling people how to protect themselves, and staff at health clinics in the affected provinces will receive refresher training on avian flu in February.
However, two imminent events will add to the challenges of containing the spread of the disease.
The first is the February 4 cremation of Norodom Sihanouk, the country's revered former king, in Phnom Penh. The government expects that more than a million people will travel to the capital to pay their respects. Many will bring food, including live poultry.
The other is Chinese New Year on February 10. In preparation for the festival, large numbers of chickens and ducks are usually transported ahead of that date to markets in the cities and towns.
Either event could promote the spread of the disease. On Tuesday, government and UN health experts met to work out how best to prevent that. Krishnan said officials would hand out information leaflets to people coming to the capital to warn them of the risks and advise them how to avoid contracting the disease. That includes not eating birds that have died from illness, and cooking poultry thoroughly.
Most of the efforts underway are designed to ensure that people do not get infected with avian flu in the first place. Once they do, the chances of recovery are slim - not least due to the country's weak healthcare system. In total, 23 Cambodians out of 26 infected to date with avian flu have died - a fatality rate close on 90 percent, and well above the global figure of nearly 60 percent.
Krishnan said part of the problem is that Cambodians typically first seek medication at their local pharmacy or private clinic. That costs precious days. Given that H5N1 can kill in around a week, by the time patients arrive at hospital "the chances are slim that they will survive."