Because once you get into March, there aren't sterile conditions.
As a result, kombucha is relatively easy to maintain as a culture outside of sterile conditions.
I'm willing to believe that they did their work under perfectly sterile conditions with respect to themselves.
Like an operating theatre, it could be scrubbed down to its present sterile condition.
If a procedure needs to be done that requires sterile conditions, I'll send the animal to a hospital.
Thus, air showers are common in many factories where sterile conditions are needed.
A cesarean delivery is performed in an operating room under sterile conditions.
Antibiotics may be administered if the procedure was not performed under sterile conditions.
Another major means of transmission were through sinks, so staff should take extra precaution in maintaining sterile conditions.
The hypodermic needle also serves an important role in research environments where sterile conditions are required.