Covid-19 testing.Thousands of staff claim they have been left terrified of infecting vulnerable clients because virus screening promised two months ago still hasn’t been delivered.The employees – who work across local authorities and private care providers – could walk out.In a consultative ballot, more than 1300 GMB members were in favour of action and another vote is expected this month.Health Secretary Jeane Freeman said routine testing will roll out this month.But GMB Scotland organiser