Only a quarter of the 59 labs that handle the world's deadliest pathogens have top-level biosecurity, experts warn. They fear lax rules could lead to another pandemic.

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Virologists Lisa Oestereich (R) and Toni Rieger work in the new Biological Security Level 4 laboratory of the Bernhard Nocht Institute for Tropical Medicine (BNI) in Hamburg, Germany, on January 25, 2013. Christian Charisius/picture alliance via Getty Images There are 59 biosafety level 4 labs (BSL-4) in the world, but only a few scored high on safety. A new report revealed only a quarter of countries with these labs have high biosecurity scores. The labs are where researchers work with the most dangerous pathogens on the planet. See more stories on Insider's business page . Only around a quarter of...