World Health Organization medics understand so little about the deadly pathogen they have named it Disease X - but they are so anxious they have added it to a shortlist of extremely deadly illnesses capable of wiping out humanity. Contenders are weighed primarily on their potential to rapidly epidemics of huge proportions, even global pandemics, as well as the real-life damage they have proven capable of.
According to experts, Disease X, in all probabilities will be man-made.
Mr Rottingen said Disease X would most likely be sparked by a "zoonotic disease" jumps from animals to humans and then becomes an epidemic, which happened with H1N1 swine flu in 2009.
The disease has joined "List of Blueprint priority diseases", of World Health Organization which includes the Ebola virus, Respiratory Syndrome (SARS, ) Zika virus and Rift Valley fever (RVF) after an annual review carried out from February 6-7 when there was an "urgent need" for accelerated research and development for the maladies.
Highlighted in the 2018 annual review of the Blueprint list of priority diseases, WHO said it developed a tool to determine which diseases and pathogens pose a public health risk due to their epidemic potential.
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"History tells us that it is likely the next big outbreak will be something we have not seen before", said John-Arne Rottingen, chief executive of the Research Council of Norway and a scientific adviser to the World Health Organization committee.
"It may seem odd to be adding an "X" but the point is make sure we prepare and plan flexibly in terms of vaccines and diagnostic tests". "We want to see "plug and play" platforms developed which will work for any, or a wide number of diseases; systems that will allow us to create countermeasures at speed".
One of the sources of Disease X could be the deliberate utilization of mystery killer disease as a weapon. Ebola is also a zoonosis.
The New York Post had also highlighted that the development of biological weapons is easier at present because of gene editing and highly advanced computers.
In particular, these experts recognized that existing drugs and vaccines need further improvement for several of the diseases considered but not included in the priority list.