Question: If you can genetically modify bacteria why do you not modify embryos to be resistant to these types of bacteria?

Simon Park answered on 14 Mar 2013:

Bacteria are very sophisticated in the way they avoid the immune system to cause illness, and it would be very difficult to engineer a resistant person. Also bacteria tend to evolve to get around problems so if it were possible to make someone immune to diseases, the bacteria would probably evolve a way around this. Just look at the problems that we’re having with antibiotic resistance at the moment.