Surface/equipment

Number of alleles detected

RFU≥100

RFU≥50

Drawer of laboratory cupboard (outside surface)

10

17

Laboratory bench

12

19

Centrifuge used for reference samples (outside surface)

1

5

Centrifuge used for evidence samples (outside surface)

1

1

Container with autoclaved tubes (outside surface)

0

1

Pipetholder in laminar flow cabinet

0

1

On/off button laminar flow cabinet

7

9

Container with autoclaved filtertips

0

0

Handle laboratory freezer

7

13

Handle laboratory fridge

2

7

Box containing centrifugal filter devices (outside surface)

1

5

Rack for tubes (empty)

14

18

Vortex

3

7

Electronic pipette

5

10

Outside laminar flow cabinet (front side)

0

0

Inside laminar flow cabinet (bottom)

0

0

Inside pipetting liquid handler with UV lamp (left side)

0

0

Inside pipetting liquid handler with UV lamp (right side)

0

0

Inside pipetting liquid handler with UV lamp (bottom)

0

0

Table 1: Numbers of alleles detected on surfaces and equipment (before decontamination procedure)