I was surprised to learn that there were 15 documented cases and 14 possible cases of workers contracting AIDS on the job. As a nursing major, this is slightly disturbing. The procedure described in the 5th article seemed very complex. It is such an ever-changing virus that even if you are immunized in one particular way you can still get the virus throughout the time of your immunization. The first video on safety in dealing with disease gave me a different point of view on researchers and the dangers of their jobs.
Science is a sometimes messy process.
The scientific method is only a guideline, and often the steps occur simultaneously.