Many workplaces require employees to possess special passes or know a code to enter the building, and the coronavirus has the same advantage when breaking into cells.

Scientists have uncovered the structure of an enzyme called nsp16 which coronavirus uses to fool the immune system and gain access to host cells, which it hijacks to replicate itself.

Understanding how nsp16 works could lead to new antiviral drugs for COVID-19 patients by inhibiting the enzyme in allowing the virus to slip past security.

The enzyme is used to modify something called the messenger RNA cap, effectively a signature which tells the cells that the proteins they’re being told to produce are the right ones.

“It’s a camouflage,” according to Dr Yogesh Gupta of the University of Texas, the lead author of the study which is published in the journal Nature Communications