Study | Country | Number of cases | PCR rate (%) |
Ti, 2014 [9] | Singapore | 55,567 | 1.9 |
Tsinopoulos, 2015 [5] | Greece | 1335 | 4.7 |
Kahawita, 2015 [8] | Australia | 3740 | 2.6 |
Kim, 2017 [7] | New Zealand | 500 | 2.6 |
Akkach, 2019 [6] | Australia | 13,124 | 1.0 |
Naderi, 2020 [4] | United Kingdom | 20,235 | 0.98 |