DALLAS (NEXSTAR/AP) — It’s one of the big questions people have about COVID-19: Can you get the coronavirus twice?

The fact is, scientists can’t say for sure. However, they believe it’s unlikely.

From the start, health experts have predicted people who had COVID-19 will have some immunity against a repeat infection. However, they don’t know how much protection or how long it would last.

So what about those reports of people testing positive for the virus weeks after they were believed to have recovered? Experts believe people were likely suffering from the same illness or the tests detected remnants of the original infection. There’s also the chance tests could have been false positives.

Scientists say there has been no documented instance of a patient spreading the virus to others after retesting positive.

With similar viruses, studies have shown that people could fall sick again three months to a year after their first infections. It’s still too early to know whether that’s also possible with the coronavirus.

“It’s very much emerging science,” said Dr. Philip Landrigan, director of the global public health program at Boston College.

A small U.S. study published last week also found the antibodies that fight the coronavirus may only last a few months in people with mild illness, suggesting people could become susceptible again. But antibodies aren’t the only defense against a virus, and the other parts of the immune system could also help provide protection.

Settling the question of whether reinfection is possible is important. If it can occur, that could undermine the idea of “immunity passports” for returning back to workplaces. And it would not bode well for hopes of getting a long-lasting vaccine.