1.   Additional tests provided a full map of the genetic makeup of the four virus isolates and the subspecies of the known infected chimpanzees.

2.   After all, they reasoned, there must be a reservoir of infected chimpanzees if the virus had passed to people.

3.   There may be widely infected chimpanzee populations, but they are so isolated that they did not spread their infection to other chimpanzees.

4.   This may indicate that these animals became physically isolated from their fellow chimpanzees before SIVcpz first infected chimpanzees, they said.

5.   The outbreak in Gabon is believed to have come from an infected chimpanzee, eaten by residents of Mayibout.