Coronavirus: worst-case possibility: that no vaccine is ever developed.

London(CNN)As countries lie frozen in lockdown and billions of people lose their livelihoods, public figures are teasing a breakthrough that would mark the end of the crippling coronavirus pandemic: a vaccine.

But there is another, worst-case possibility: that no vaccine is ever developed. In this outcome, the public's hopes are repeatedly raised and then dashed, as various proposed solutions fall before the final hurdle.

Instead of wiping out Covid-19, societies may instead learn to live with it. Cities would slowly open and some freedoms will be returned, but on a short leash, if experts' recommendations are followed. Testing and physical tracing will become part of our lives in the short term, but in many countries, an abrupt instruction to self-isolate could come at any time. Treatments may be developed -- but outbreaks of the disease could still occur each year, and the global death toll would continue to tick upwards.

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