Thursday: What kinds of diseases?

From Exodus 12-15:

1. In Exodus 12:38 it says that other people went up with them. I wonder, were these people possibly Egyptians who decided to join the Israelites? I wonder if they had any desire to join in the Passover lamb dinner. If they did not, could they still use the blood on the doorframes and still receive mercy? (It appears that they could, but...) Were any of them willing to go through the rite of being circumcised in order to partake in the Passover lamb? (Exodus 12:48) That would have been painfully tough, as after that they were traveling frequently for a while.

2. The Lord commanded the Israelites not to break any of the bones of the Passover lamb (Exodus 12:46) that saved the lives of the firstborn. It is a foreshadowing of Jesus, who would also die in place of all mankind, to satisfy the requirements of God's curse on sin. Jesus also had no bones in his body broken.

3. It is funny to think this way, but I believe that the reason that God had the Israelites wait around so that the Egyptian army could catch up was so that he could "flex his muscle" in front of all the Israelites. I think that some of them still did not realize how powerful God is and what he would do for them. This was their opportunity for a ring-side seat to see a demo.

4. What kinds of diseases? In Exodus 15:26, God tells the Israelites that if they are careful to keep his commands, they will not get any of the diseases that the Egyptians got. I wonder what kind of diseases the Egyptians had. Were these sicknesses due to the environment that the Egyptians created around themselves, or due to God's curse upon their sinful lifestyles, or because of other things?