To use the equation \( y = 2^x \) to determine how many people will become infected after 11 minutes, you will need to substitute \( x \) with 11.
So we have: \[ y = 2^{11} \]
Calculating \( 2^{11} \):
\[ 2^{11} = 2048 \]
Therefore, after 11 minutes, \( 2048 \) people will become infected with Strain B.