It is likely that Johnson was spinning his infection. He might well have had the SARS-Cov2 virus. But it seems implausible that he had the Covid-19 fever the virus causes, and which is the lethal part.
Covid19
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Hong Kong and Israel have had cases too, suggesting it is too late to contain it
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‘Gene within a gene’ found in SARS-CoV-2 – LiveScience excerpt
11 November 2020“The newly identified gene – called ORF3d – is an example of what’s called an overlapping gene:”
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The Trumps have Covid-19? Pardon my tinfoil hat, but…
2 October 2020“I am not entirely convinced he is being truthful here.”