I counted the number of cells in the four smack packs. Here are the results:
Sample % Viability Viable Cells/ml Total Viable Cells
Wyeast 1028 90.6 8.64e8 1.04e11
Wyeast 1098 97.7 7.83e8 9.39e10
Wyeast 1099 96.0 4.76e8 5.72e10
Wyeast 1882 98.3 1.22e9 1.46e11
The 1099 has only half the amount of cells it ought to – only 57 billion. So I bought another pack (and emailed Wyeast), and started another pack yesterday. Tomorrow is brew day, so I’ll count them in the morning, then get brewing.