Smallpox is the only virus that is officially eradicated. That is why only elderly age groups are vaccinated against it. But stocks of the virus are still held by certain governments and this episode goes onto show what might happen if those sources were used as a weapon of mass destruction.
In this epsiode of Virus Empire, we feature the work of researchers like Brazilian Luiz Pereira, American Nathan Wolfe and French Xavier Pourrut in the tropical forests in South America, Asia and Africa as they hunt for the coming killers. These are the still unknown viruses that could very soon jump from animals to humans.
Experts fear that during outbreaks of killer viruses like ebola or the Marburg virus, terrorists could get the germs from the infected persons and then synthetically multiply them - as it was done in Soviet laboratories twenty years ago.

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