Some samples are frozen and then thawed days later and 50 uL are plated onto a 96 well tray from which DNA is extracted. The
blood samples
are stored in tubes like eppendorf tubes, but
with screw caps.
The last week of June, 2008, I set up this tray of 50 uL samples. A sample on this tray was HIV positive. I was definitely wearing latex gloves and a lab coat, but am not certain if I was wearing a face shield.