|Diseases in 'Factor X' could be next global threat
Ancient bacteria under frozen ground could contain many deadly diseases. The microbes have been trapped for millennia in permafrost. This is ground that stays completely frozen for at least two years. It is common in mountains and near the North and South Poles. The permafrost is melting because of climate change. The result could be the release of unknown, harmful viruses. Scientists are calling these 'Factor X'. A professor in infectious diseases said we know little about Factor X and the biological dangers trapped in Earth's permafrost.