The CEO of AstraZeneca said immunity from a coronavirus vaccine may only last for a year, which means people would need annual inoculations to protect themselves from the virus.

Pascal Soriot told CNBC’s “Squawk Box Europe” Thursday that one vaccine will likely not be enough.

“What we know is that most companies are targeting two injections for the initial vaccination and then our own assumption based on what we know from the technology we use with SARS 1 is that the immunity could last 12 months, maybe 18 months,” he said.

“But the truth is that we don’t know, this virus is very unpredictable.”

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