Probably not to a high degree of accuracy. Many will die without having been tested and diagnosed. Some will die indirectly of complications. The testing itself

Probably not to a high degree of accuracy. Many will die without having been tested and diagnosed. Some will die indirectly of complications. The testing itself is not perfect. Seriological screening will only give us an approximation for how widespread total infections have been, since we know some infections will pass unseen. For instance spain just released a study indicating that 5% of their population of has been exposed and 1/3 of those had no symptoms. That means that exposure is ten times the tested rate.