A clamour by ship managers to get hold of Covid-19 vaccines has sparked concerns that unapproved vaccines may hit the market.

This week, the Maritime and Port Authority of Singapore added Bangladesh, Nepal, Pakistan and Sri Lanka to the list of countries from which visitors are barred, effectively ruling out crew changes. That follows a ban on recent visitors to India.

In response to the worsening situation, ship managers’ association Intermanager has said it is ready to go it alone to secure its own vaccines.