To Delma Childers,When and how did you come across the fact that some of the harmless bacteria on Earth multiply in

Question: To Delma Childers, When and how did you come across the fact that some of the harmless bacteria on Earth multiply in space, and can be harmful?
- Keywords:
  bacteria,
  harmful,
  multiply
Asked by Kiri to Delma on 14 Jan 2016.
- Delma Childers answered on 14 Jan 2016:
  
  Several studies with bacteria from Earth have been performed on space stations and shuttle missions. Here is a link to a NASA article about one of these experiments, where a bacterium produced more cells and larger communities in space:
  
  http://www.nasa.gov/centers/ames/news/2013/bacteria-sent-into-space.html
  
  And this slightly advanced scientific research article is the source for the NASA article, but also goes on to explain the kinds of problems this posed on the Mir space station:
  http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0062437

Question: To Delma Childers, When and how did you come across the fact that some of the harmless bacteria on Earth multiply in space, and can be harmful?