One of the union's leaders, Ephraim Kalsakau, said there is no law that can penalise a worker who has not been vaccinated against the Covid-19 virus.
He said even if it is covered under the employee's contract, it cannot be effective if Vanuatu's law does not cover it.
While Vanuatu is Covid-free, and its vaccine rollout began successfully in recent months, there's debate about whether employers can make vaccination mandatory for their staff.
