Answer:
A) 1000
Most viruses are 1000 times smaller than the average cell
Here is what I found, its quite interesting, I hope it helps..
https://www.fbi.gov/services/laboratory/biometric-analysis/codis/codis-and-ndis-fact-sheet
Remind the parents to observe the child for :
1. excessive bleeding.
2. infection at the surgical incision site.
If any of these are observed, the child should get immediate medical attention.