New research on the Wuhan coronavirus has found the virus may be present in the lungs of individuals with no obvious symptoms, making strict quarantine and contact-tracing regimes crucial to preventing the number of cases from reaching the scale of the 2003 Sars outbreak.Without close surveillance, these patients – described by researchers as “cryptic cases of walking pneumonia”– could prove to be yet another factor in the dangerous trajectory of the Wuhan virus, with the number of infections…
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