A nurse who delightedly posted the news that they had been vaccinated against Covid-19 has been diagnosed with the deadly virus just eight days later.
The nurse, a man identified only as "Matthew" who works in the emergency rooms of two hospitals in San Diego, California, wrote "Got my COVID vaccine!" in an Instagram post on December 18.
But by Christmas Eve he was feeling decidedly unwell, with chills, muscle aches and severe tiredness.
On Boxing Day, Matthew tested positive for coronavirus.
Infectious disease expert Dr Christian Ramers, from the Family Health Centres of San Diego, said that the diagnosis is no great surprise.
Dr Ramers told ABC News: "It’s not unexpected at all. If you work through the numbers, this is exactly what we’d expect to happen if someone was exposed."
He said that Matthew was most probably been infected with coronavirus before he was vaccinated.
"We know from the vaccine clinical trials that it’s going to take about 10 to 14 days for you to start to develop protection from the vaccine," he added.
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Saying that he knew of other healthcare professionals that had also tested positive around the same time as they had been given the vaccine, Dr Ramers continued: "That first dose we think gives you somewhere around 50 per cent, and you need that second dose to get up to 95 per cent."
Matthew had been injected with the first of two injections of the Pfizer vaccine.
He described the atmosphere of the vaccination centre as something like a drug den.
"The 15 minutes afterwards sitting around with a bunch of others while healthcare workers asked us how we felt made me think of an opium den. I’ll report back if I start to grow a third arm."
He still hasn’t got a third arm, but he was one of the unlucky few to become infected before the vaccination’s full protective effects took hold.
Despite being one of the first US states to implement a lockdown, California has been hit hard by the pandemic.
At the beginning of this week, state health authorities reported that there had been more than 2.1m cases and over 24,000 deaths.
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