With the death toll soaring past 300,000 this year and a quarter of humanity now infected, the pandemic shows no signs of abating as it spreads invisibly throughout vulnerable communities.
Yet unlike the novel coronavirus, this disease is preventable, curable and centuries-old: tuberculosis.
On the occasion of World TB Day, experts warned Tuesday that the sheer number of people impacted by tuberculosis -- which leaves survivors with permanent lung damage -- means there are additional millions globally vulnerable to COVID-19.
TB is latent in one in four people on Earth and has been around for tens of thousands of years. Every year around 10 million people are infected; more than 1.2 million die.
While TB was declared a global health emergency by the World Health Organization back in 1993, it remains the world's number one infectious killer.
The vast majority of TB deaths occur among poorer populations, meaning the disease is largely out of the mind of policymakers despite its devastating annual toll.
Experts say that global health systems could learn a number of lessons from the fight against TB, for which a vaccine exists and a diagnostic test takes minutes.
"We know what works to fight COVID-19 from our experience and the tools we have to end TB: infection control, widespread testing, contact tracing," said Jose Luis Castro, executive director of The International Union Against Tuberculosis and Lung Diseases.
"Prevention of any disease requires political will -- and prevention remains the biggest tool we have to address COVID-19." As of Tuesday 1100 GMT, there had been more than 386,350 confirmed COVID-19 cases, 16,961 of which have proved fatal.
World governments have taken unprecedented peacetime measures to try to slow the spread.
Several European nations have announced country-wide lock downs as well as massive economic stimuli and financial support for businesses and workers. Grania Brigden, TB director at The tuberculosis union, told AFP that testing capacity was crucial in tackling both diseases.
"With TB we've struggled with research and development investment to get good, accurate diagnostic tools and better treatment but actually we are there now," she said.
"It goes to show that where there is political will things can happen and unfortunately in TB the political will has always been an issue."
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