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# Table 1 **A**. Definition of the variables (MC, Ar, SI) used in SpolDB4 to define : (1) the geographic index C1 (Endemic, Localized, Ubiquitous) (2) the quantitative index C2 (Epidemic, Common, Recurrent, Rare). **B**. Distribution of the 1939 Shared-types in 12 classes.

Name | Abbreviation | Type of data, Def. | Rules for Definition of Qualifiers (C1 and C2) | |
---|---|---|---|---|

A Definitions
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Matching Code | MC | 1–8 digits, built by linking region codes |
If 1 digit, then C1 = Endemic (genotype found in one macroregion only) If 2 digits, then C1 = Localized (genotype found in two macroregions) If ≥ 3 digits, go to Area section below for further interpretation | |

Area | Ar | numeric, n° of countries in which a given SIT is found |
If MC ≥ 3 digits and Areas ≤ 5; C1 = Localized If MC ≥ 3 digits and Areas ≥ 6; C1 = Ubiquitous (genotype found in more than three macroregions) | |

Spreading Index | SI | numeric, mean indicator of spreading independent of geography SI = n/Ar where n is the absolute value for a given shared-type |
If SI ≥ 25; C2 = Epidemic If 10 < SI < 24; C2 = Common If 3 < SI < 9; C2 = Recurrent If SI ≤ 2; C2 = Rare | |

B Distribution of the 1939 genotypes in 12 class
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Endemic Epidemic | 6 | Endemic Recurrent | 286 | |

Localized Epidemic | 2 | Localized Recurrent | 207 | |

Ubiquitous Epidemic | 6 | Ubiquitous Recurrent | 176 | |

Endemic Common | 31 | Endemic Rare | 501 | |

Localized Common | 14 | Localized Rare | 587 | |

Ubiquitous Common | 20 | Ubiquitous Rare | 82 | |

NA* | 21 | Total | 1939 | |

*not applicable |