The number of countries where people can buy a fake Covid-19 test seems to be growing.

Alarms have been going off over the number of people testing positive on their first day in managed isolation here, even though they've earlier produced a negative pre-flight test.

Cyber security company Checkpoint's Oded Vanunu told Kate Hawkesby it's becoming an international issue.

"It originally started in the US and the UK. Today in 2021, it's now spreading in a diversity of countries.

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