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Volume 17, Number 10—October 2011

Dispatch

Global Distribution of Shigella sonnei Clones

Ingrid Filliol-Toutain, Chien-Shun ChiouComments to Author , Caterina Mammina, Peter Gerner-Smidt, Kwai-Lin Thong, Dac Cam Phung, Mariana Pichel, Reza Ranjbar, Amy Gassama Sow, Kara Cooper, Efrain Ribot, Norma Binsztein, and Shiu-Yun Liang

Author affiliations: Institut Pasteur, Paris, France (I. Filliol-Toutain); Chung Shan Medical University, Taichung, Taiwan (C.-S. Chiou); Centers for Disease Control, Taipei, Taiwan (C.-S. Chiou, S.-Y. Liang); University of Palermo, Palermo, Italy (C. Mammina); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (P. Gerner-Smidt, K. Cooper, E. Ribot); University of Malaya, Kuala Lumpur, Malaysia (K.-L. Thong); National Institute of Hygiene and Epidemiology, Hanoi, Vietnam (D.C. Phung); Instituto Nacional de Enfermedades Infecciosas, Buenos Aires, Argentina (M. Pichel, N. Binsztein); Molecular Biology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran (R. Ranjbar); Institut Pasteur de Dakar, Dakar, Senegal (A. Gassama Sow)

Main Article

Table

Allelic diversity and range of repeats of VNTRs for 3 major Shigella sonnei clonal groups*

VNTR Repeat unit, bp No. alleles Clonal group A, n = 1,382
Clonal group B, n = 75
Clonal group C, n = 212
Allelic diversity† Range of repeats Allelic diversity Range of repeats Allelic diversity Range of repeats
SS1 7 16 0.71 1–16 0 1 0 1
SS2 9 3 0.02 2–3 0 2 0.04 1–3
SS3 7 30 0.88 2–29 0.90 2–34 0.82 2–28
SS4 7 3 0.01 2–6 0 2 0.10 2–3
SS5 7 3 0.08 2–4 0.03 2–3 0 3
SS6 7 29 0.85 2–31 0 2 0.86 4–30
SS7 7 3 0.49 2–3 0 2 0.02 2–3
SS8 60 3 0 1 0.10 1–2, 330‡ 0.45 1–2
SS9 6 16 0.65 2–18 0.83 5–18 0.77 2–18
SS10 6 9 0.57 2–10 0.46 3–8 0.53 0, 3–8
SS11 6 8 0.63 2–9 0.64 2–8 0.65 3–9
SS12 9 5 0.01 2–3 0.58 2–6 0.18 2–4
SS13 6 5 0.19 2–6 0.03 0, 2 0.07 2–4
SS14 9 4 0.01 2–3 0 2 0.37 2–6
SS15 6 3 0.04 2–3 0.21 3–4 0.02 2–3
SS16 17 3 0.07 1–2 0 2 0.06 1–3
SS17 6 2 0 0, 2 0.15 2–3 0.04 2–3
SS18 5 3 0.01 2–3 0 2 0.30 2–4
SS19 5 2 0.03 2–3 0.23 2–3 0.03 2–3
SS20 40 2 0.04 1–2 0 1 0 1
SS21 18 3 0.01 0, 1–2 0.12 1–2 0.24 1–4
SS22 11 2 0.01 1–2 0.03 1–2 0 1
SS23 16 8 0.03 0, 2–6 0.55 0, 2–5 0.69 0, 2–10
SS24 168 2 0.06 0, 1–2 0.03 0, 1 0.05 1–2
SS25 135 2 0.01 1–2 0.03 1–2 0.41 1–2
SS26 101 5 0.01 2–5 0.03 1–5 0 4

*VNTR, variable number tandem repeat.
†Simpson's diversity index = 1 – Σ(n/N)2.
‡Allele 330 for SS8, which has an imperfect repeat, is designated by the size of amplicon instead of the number of repeats.

*VNTR, variable number tandem repeat.
†Simpson's diversity index = 1 – Σ(n/N)2.
‡Allele 330 for SS8, which has an imperfect repeat, is designated by the size of amplicon instead of the number of repeats.

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