Table 1. The list of countries that experienced importation of Zika virus infection.
The earliest date at which an infected individual has likely to have entered the country is shown as the week counting from week 26, 1946. Extracting the dataset from the World Health Organization source, the week number of the report has been originally written and we used it as the week of importation. When the exact week was unavailable, the mid-point of the available time window was used as the week of importation. The first day of the year was set to be the first Sunday of January. One year was calculated to be exactly equal to 52 weeks in our analysis. Although three confirmed cases of ZIKV infection were reported in Chile on 2 February 2016, that data was ignored in the present study because the latest time was set at fourth week of 2016. We also did not count a case report from Easter Island, a Chilean island in the southeastern Pacific Ocean, because the island is geographically distant from other parts of Chile and has only one airport (World Health Organization, Western Pacific Region, 2016). In Australia, although one imported case is reported, there were no available sources of information to identify the date of confirmation. Instead, given that the corresponding article was received on 16 January 2013, we consider that the importation event took place in the previous year, 2012, and took the mid-point of the year as the week of importation (Kwong, Druce & Leder, 2013). In Zambia, a cross sectional study was conducted, but there was no available information to identify the date of importation or survey. Thus, the year of the acceptance of the article, 2015, was assumed as the year of importation (Babaniyi et al., 2015).
| Country | Year | Week | Weeks since Uganda | Country | Year | Week | Weeks since Uganda |
|---|---|---|---|---|---|---|---|
| Countries up to Brazil | Countries after Brazil | ||||||
| Uganda | 1947 | 26 | 0 | Vanuatu | 2015 | 17 | 3,527 |
| Tanzania | 1948 | 26 | 52 | Sweden | 2015 | 28 | 3,538 |
| Indonesia | 1951 | 26 | 208 | Fiji | 2015 | 33 | 3,543 |
| Malaysia | 1951 | 26 | 208 | Samoa | 2015 | 37 | 3,547 |
| India | 1952 | 26 | 260 | Colombia | 2015 | 42 | 3,552 |
| Philippines | 1953 | 26 | 312 | Suriname | 2015 | 45 | 3,555 |
| Egypt | 1953 | 26 | 312 | El Salvador | 2015 | 47 | 3,557 |
| Thailand | 1954 | 26 | 364 | Guatemala | 2015 | 47 | 3,557 |
| Vietnam | 1954 | 26 | 364 | Mexico | 2015 | 48 | 3,558 |
| Angola | 1960 | 22 | 672 | Venezuela | 2015 | 48 | 3,558 |
| Kenya | 1967 | 26 | 1,040 | Netherlands | 2015 | 48 | 3,558 |
| Ethiopia | 1967 | 26 | 1,040 | Panama | 2015 | 48 | 3,558 |
| Somalia | 1967 | 26 | 1,040 | Paraguay | 2015 | 48 | 3,558 |
| Gabon | 1967 | 26 | 1,040 | Honduras | 2015 | 51 | 3,561 |
| Nigeria | 1968 | 26 | 1,092 | Cape Verde | 2015 | 51 | 3,561 |
| Central African Republic | 1968 | 26 | 1,092 | Spain | 2015 | 52 | 3,562 |
| Senegal | 1968 | 26 | 1,092 | Puerto Rico | 2016 | 1 | 3,563 |
| Sierra Leone | 1972 | 26 | 1,300 | Martinique | 2016 | 2 | 3,564 |
| Pakistan | 1980 | 26 | 1,716 | French Guiana | 2016 | 2 | 3,564 |
| Cote d’Ivoire | 1980 | 26 | 1,716 | Finland | 2016 | 2 | 3,564 |
| Burkina Faso | 1981 | 26 | 1,768 | United Kingdom | 2016 | 3 | 3,565 |
| Micronesia | 2007 | 26 | 3,120 | Taiwan | 2016 | 3 | 3,565 |
| United States | 2008 | 26 | 3,172 | Bolivia | 2016 | 3 | 3,565 |
| Cameroon | 2010 | 26 | 3,276 | Ecuador | 2016 | 3 | 3,565 |
| Cambodia | 2010 | 34 | 3,284 | Haiti | 2016 | 3 | 3,565 |
| Australia | 2012 | 26 | 3,380 | Guadeloupe | 2016 | 3 | 3,565 |
| Canada | 2013 | 5 | 3,411 | Barbados | 2016 | 3 | 3,565 |
| Germany | 2013 | 26 | 3,432 | Guyana | 2016 | 3 | 3,565 |
| French Polynesia | 2013 | 46 | 3,452 | Argentina | 2016 | 4 | 3,566 |
| Japan | 2013 | 50 | 3,456 | Peru | 2016 | 4 | 3,566 |
| Norway | 2013 | 50 | 3,456 | Portugal | 2016 | 4 | 3,566 |
| Italy | 2014 | 1 | 3,459 | Austria | 2016 | 4 | 3,566 |
| New Caledonia | 2014 | 1 | 3,459 | Costa Rica | 2016 | 4 | 3,566 |
| Cook Islands | 2014 | 9 | 3,467 | Switzerland | 2016 | 4 | 3,566 |
| Solomon Islands | 2014 | 12 | 3,470 | Dominican Republic | 2016 | 4 | 3,566 |
| Zambia | 2014 | 26 | 3,484 | Jamaica | 2016 | 4 | 3,566 |
| Belgium | 2014 | 38 | 3,496 | Denmark | 2016 | 4 | 3,566 |
| Brazil | 2015 | 12 | 3,522 | Virgin Islands | 2016 | 4 | 3,566 |
| Nicaragua | 2016 | 4 | 3,566 | ||||
| Tonga | 2016 | 4 | 3,566 |