"We value the hard work and dedication of the drivers who deliver great service and products to our customers," the company said in a statement.
Free for those on select plans (see details below)
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"I've always been adventurous and interested in finding the most wild places," says McKenzie, speaking to the BBC via a satellite-connected video call.
The vaccine doesn't guarantee lifetime immunity, but it does greatly reduce the risk of someone developing chickenpox or having a bad case.