Table 2 BioSpot counting parameters for the MNA

From: Quantification of SARS-CoV-2 neutralizing antibody by wild-type plaque reduction neutralization, microneutralization and pseudotyped virus neutralization assays

Parameter

Setting

Parameter

Setting

Counting mask size (%)

85

Edge Effect Compensation

OFF

Normalise Counts of Mask

ON

Weight Function Shape

0.5

Smart Count

ON

Edge Compensation Level

1.0

Default sensitivity

145

Edge Compensation Before PP

ON

Min. SpotSize

0.0051 Sq.mm

Ring-wise Compensation

OFF

Max SpotSize

0.2012 Sq.mm

Sensitivity Offset

50

Spot Separation

10.00

Border Radius Percentage [%]

30.0

Diffuseness

Largest

Border Outline Percentage [%]

80.0

Overdeveloped area handling

Active

Spot Circularity Filtering

OFF

Auto Areas

Estimate

Area Weight

0

Manual Areas

Normalized

Circularity Threshold

1.5

Objects

Normal, diffuse spots, high background

Maximum area of filtered spots [pix]

500.0

Background balance

ON (80)

Use Global Object Enhancement

OFF

Fill Holes

OFF

Method

Enhanced Separation

‘Fiber’ Removal

ON

Aperture [pix]

20

Spots Removal

Inactive

Weight

3.0

ROI-Touching Removal

OFF

Enhanced Separation Level

0