Is There a Causal Effect?

There is an under reporting factor of 31%, according to one estimate. That means that the number of people who would die from a severe adverse event if they had taken fizer's drug was less than 50%. The company has not acknowledged any deaths in its clinical trials, but there are other studies which suggest this figure could be much higher. Fiser says it will take at least two years for all these cases to be fully investigated and resolved.