chie yamaguchi, nhk world, tokyo. >>> health care workers in the u.s. have started testing an ebola vaccine on humans. scientists in canada developed the drug, and government officials there say it could be shipped to west africa within months, if clinical trials prove successful. more from nhk world's craig dale. >> reporter: canadian officials are calling this the phase one clinical trial. there will be further tests in humans. studies in primates have shown this vaccine works to prevent infection, and to increase the chances of survival after exposure. canada supplied two vials of this experimental vaccine for the clinical trial. teams at a u.s. military lab will be giving the drug to 40 healthy volunteers who won't be at risk because it does not carry live ebola virus. >> a team of health care officials will monitor them for side effects and take blood samples to see how effective the immune systems are at making ant antibodie antibodies. >> reporter: antibodies help us fight infections. if all goes well this vaccine will be sent to west africa wher