As the virus continues to circulate through west Africa, it may like any other pathogen continue to acquire genetic mutations. So far, however, there is no indication that Ebola is mutating in a way that could allow it to make the leap from becoming transmissible via contact with body fluids (as it is now) to become a germ that could be transmitted by breathing the same air, according to WHO. With Ebola, "I don't think we have the information at this time to know what the real risk is but it is probably not zero,” says Ebola expert Thomas Geisbert, a virologist at UTMB.