why when you grow the cells and embryos do they have to be kept in a clean place and what would happen if they were in

Question: why when you grow the cells and embryos do they have to be kept in a clean place and what would happen if they were in a dirty or infectious place?

Asked by megan to Sharon on 20 Mar 2010 in Categories: Test methods.
- Sharon Sneddon answered on 21 Mar 2010:
  
  When you grow cells and embryos out of the body, they can pick up infections which are mainly bacteria really easily so we need to take care we don’t infect them. If they get infections, its just like when we do, they get “sick” and the cells will die. We try and keep them clean by wearing labcoats and gloves and using everything that has been sterilised!

Question: why when you grow the cells and embryos do they have to be kept in a clean place and what would happen if they were in a dirty or infectious place?