21.   Pfizer said the study was conducted with the approval of the Nigerian federal and state governments and with the consent from the families of treated patients.

22.   By checking records of previously treated patients, they found that one form was deadlier than the other.

23.   Dr. Claudine Isaacs of Georgetown University in Washington, D.C., called the project important for illustrating what really happens to treated patients.

24.   So the Massachusetts-based company tracked down treated patients to run more tests.

25.   The FDA has charged that researchers delayed reporting two previously treated patients who suffered liver toxicity, and that two monkeys died in a similar experiment.