But risks related to the vaccine are not as great as the risk of having smallpox infection.

It has also been shown to be effective against pox viruses as well and is therefore a candidate to be used to treat smallpox infections.

In temperate areas, the number of smallpox infections were highest during the winter and spring.

Age distribution of smallpox infections depends on acquired immunity.

Historically, the vaccine has been effective in preventing smallpox infection in 95% of those vaccinated.

Medical officials from the city and the state have been meeting regularly to coordinate plans for all types of terrorism, including smallpox infection, Dr. Frieden said.

By 10 July 2002 (day 90), there were 27,456 fatalities in New York City, however the rate of smallpox infections dropped for the first time.

In the past, when a smallpox infection was diagnosed, infected people were kept away from others to prevent the spread of infection.

Immune responses generated from a Vaccinia virus infection protects the person against a lethal smallpox infection.

The isolation of sick people in hospitals or charities at the outsides of the cities was another important measure to stop the smallpox infection.