Question

Why did Dr Cook persuade tell the boys to return in a week's time? .. ​

Answer 1

Explanation:

Cook was praying that the vaccine had kept its strength after a full long nine month stretch. ... Cook wanted to see the results of the effect of vaccine on the boys of he asked them to return in a week.

Answer 2

Cook persuaded few boys to submit to vaccination to see if the vaccine,s effect of it would work or not. ... Cook wanted to see the results of the effect of vaccine on the boys of he asked them to return in a week.