Populations of viruses do not grow through cell division because they are not cells.
Influenza is a disease caused by viruses.
Populations of the cause of influenza do not grow through cell division because they are not cells.
The cause of what doesn't grow by cell division?

1: drought
2: Influenza
3: resistance
4: adding heat
5: Leptospirosis
6: fungi
7: bacteria
8: heat produced