Untraceable coronavirus cells have emerged in three countries — and health officials say the elusive strands could be the first sign that the virus is spreading at an uncontrollable pace.

Doctors are unable to identify the source of coronavirus clusters in South Korea, Singapore and Iran, the World Health Organization said Saturday, urging a stricter approach to containing the virus.

“A number of spot fires occurring around the world is a sign that things are ticking along, and what we are going to have here is probably a pandemic,” said Ian Mackay, a researcher at Australia’s University of Queensland.

Doctors began floating fears of a pandemic — which occurs when a disease spreads to two continents — on Friday as two more died in Iran, the number of cases in South Korea doubled, and Italy saw its first death.

In Iran, an untraceable case that’s spread to 28 others is believed to have popped up in the city of Qom.

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