Marburg is only one instance to which that question applies. Why not more Hendra? Why not more Nipah? Why not more Ebola? Why not more SARS? If bats are so abundant and diverse and mobile, and zoonotic viruses so common within them, why don’t those viruses spill into humans and take hold more frequently? Is there some mystical umbrella that protects us? Or is it fool’s luck?
