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Table 2 Comparison of back-staining and pre-staining of Anodisc membranes in VLP enumeration of three sample types

From: A protocol for enumeration of aquatic viruses by epifluorescence microscopy using Anodisc™ 13 membranes

Sample

Filtera

Staining method

Rinse

VLP b

CV c

 

Ano 25

Back

No

1.32 × 106 (0.08)

5.7

 

Ano 25

Back

Yes

1.32 × 106 (0.10)

7.5

Cyanophage lysate

Ano 25

Pre

No

1.63 × 106 (0.07)

4.5

 

Ano 25

Pre

Yes

1.54 × 106 (0.15)

9.6

 

Ano 13

Pre

No

1.29 × 106 (0.13)

10.1

 

Ano 13

Pre

Yes

1.26 × 106 (0.07)

5.8

 

Ano 25

Back

No

9.59 × 105 (1.86)

19.4

 

Ano 25

Back

Yes

1.66 × 105 (0.37)

22.5

Sargasso Sea water

Ano 25

Pre

No

7.50 × 105 (1.30)

17.3

 

Ano 25

Pre

Yes

1.75 × 105 (0.17)

9.7

 

Ano 13

Pre

No

5.93 × 105 (1.15)

19.3

 

Ano 13

Pre

Yes

2.28 × 105 (0.54)

23.5

 

Ano 25

Back

No

14.99 × 105 (0.45)

3.0

 

Ano 25

Back

Yes

3.22 × 105 (1.06)

32.9

Southeastern US coastal waters

Ano 25

Pre

No

4.41 × 105 (0.62)

13.9

 

Ano 25

Pre

Yes

3.28 × 105 (0.35)

10.7

 

Ano 13

Pre

No

2.58 × 105 (0.35)

13.7

 

Ano 13

Pre

Yes

2.75 × 105 (0.41)

14.9

  1. a Anodisc™ 25 mm (Ano 25) and 13 mm (Ano 13) membranes
  2. b Average VLP abundance from triplicate filters along with the standard deviation
  3. c The percent coefficient of variation from 3 replicate measures.