Washington — IBM is sounding the alarm over hackers targeting companies critical to the distribution of Covid-19 vaccines, a sign that digital spies are turning their attention to the complex logistical work involved in inoculating the world’s population against the coronavirus.

The IT company said in a blog post published on Thursday that it had uncovered “a global phishing campaign” focused on organisations associated with the Covid-19 vaccine “cold chain” — the process needed to keep vaccine doses at extremely cold temperatures as they travel from manufacturers to people’s arms...

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