The world is embroiled in a high stakes game of ‘hide-and-go-seek’. As countries toil with the best method of defeating an invisible enemy, World Health Organisation (WHO) director-general Tedros Adhanom has a simple message: “test, test, test”.

At first glance, it may seem confusing as to why the early evidence suggests that comprehensive testing programmes have proven to be arguably the most effective tool in “flattening the curve”. It may be obvious as to why testing would better reveal the extent of the virus, but not necessarily how testing can combat the virus itself...

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