The theory is that if a healthy person comes in contact with a person infected with H1N1, the healthy person may build up a resistance to the virus and avoid getting sick later on.

State health officials said they're not aware of any of these parties taking place in Montana. Jon Ebelt with the Department of Health and Human Services said people should avoid coming in contact with anyone infected with H1N1.

"We strongly discourage this activity," he said. "Its not a good idea. Although the symptoms for the most part of H1N1 have been mild, there's no way to predict with any certainty what the outcome would be for an individual."

Meanwhile the head of the World Health Organization said the virus has not mutated into a more deadly strain, as they originally thought it might. For now, the infection is generally mild and most people recover without treatment.

Officials expect a vaccine to be available in the first few weeks of October.