Table 1 Characteristics of the 4 Primary and 10 Additional MenB Test Strains.

From: Selection of diverse strains to assess broad coverage of the bivalent FHbp meningococcal B vaccine

Strain

FHbp variant

Percentage identity to vaccine component

Strain MEASURE MFIa (±1 SD)

FHbp variant group MEASURE MFI medianb (±1 SD)

Clonal complex

Country of isolation

Primary Strains

 PMB80

A22

88.9

3127 (2440, 4007)

2502 (1952, 3207)

CC41/44

United States

 PMB2001

A56

98.1

5002 (3903, 6410)

5002c

CC213

France

 PMB2948

B24

86.2

6967 (5436, 8929)

8457 (6599, 10,839)

CC32

France

 PMB2707

B44

91.6

11,283 (8804, 14,461)

14,753 (11,511, 18,907)

CC269

United Kingdom

Additional Strains

 PMB3010

A06

96.2

3370 (2629, 4319)

3088 (2410, 3958)

CC461

United Kingdom

 PMB3040

A07

85.4

1379 (1076, 1767)

1100 (858, 1409)

CC162

Germany

 PMB824

A12

85.4

2540 (1982, 3255)

2467 (1925, 3161)

CC35

United States

 PMB1672

A15

85.1

2995 (2337, 3838)

2904 (2266, 3721)

CC103

France

 PMB1989

A19

88.1

1934 (1509, 2479)

1759 (1372, 2254)

CC8

United Kingdom

 PMB3175

A29

93.1

3839 (2995, 4920)

5994 (4677, 7682)

CC32

United States

 PMB1256

B03

90.8

3976 (3102, 5096)

2935 (2290, 3762)

CC41/44

United Kingdom

 PMB866

B09

88.1

2089 (1630, 2677)

2275 (1775, 2916)

CC269

United Kingdom

 PMB431

B15

86.5

3785 (2953, 4851)

4822 (3763, 6180)

CC41/44

United States

 PMB648

B16

86.2

2347 (1831, 3008)

1996 (1557, 2558)

CC41/44

United Kingdom

  1. FHbp factor H binding protein, MenB Neisseria meningitidis serogroup B, MFI mean fluorescence intensity, SBA serum bactericidal assay
  2. aMFI ± 1 SD from MEASURE assay
  3. bBased on the MenB SBA isolate collection (n = 1263), except for variant group A07, which was calculated from the extended MenB SBA isolate collection (n = 1814). Strains in each FHbp variant group with expression levels at or below median levels for the respective FHbp variant group were randomly selected. The cutoff level adopted for each FHbp variant group was the observed median MFI plus 1 SD, using the precision estimate of 25.2% relative SD
  4. cThere is only one strain expressing A56; thus, no SD values are included