12. Why do we have an immune system? Why do we need an immune system?

Number 3?

1. Imagine that a parent has brought their child in for a routine vaccination. They say, "Before you give my child the shot, make sure to sanitize their skin!" Should you sanitize their child's skin? Why or why not? Make sure to show your understanding of the word sanitize in your answer.

5. Speculate on the validity of the following statement from the post: “Our babies would be protected from many/ most infectious diseases if their mothers were allowed to have natural immunity and pass it to their babies in breast milk, and we had true herd immunity through adults who had life-long natural immunity.” 6. To develop “natural” immunity as described by the poster, one would likely need to develop an infectious disease. Discuss/brainstorm ideas concerning the public health and economic implications of treating disease in the population versus vaccinating the population.