Evidence suggests that the initial infections of the current epidemic began some time in the early or mid-1970's.

The final story takes place 38 to 42 days after the initial infection.

Following the initial infection, there may be no further evidence of illness for the next 10 years.

"It may be that the initial infection was far greater than we thought."

If the initial infection is mostly in the lower tract, after treatment the person may have few difficulties.

The symptoms can occur up to 30 days after the initial infection.

The risk of death during the initial infection has fallen in recent years.

There may be a papule at the site of initial infection.

Most victims died two to seven days after initial infection.

This phase may develop months or years after initial infection.