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