Ebola vaccine proves effective, final trial results show
![woman putting ebola vaccine into canister](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/12/122216_ebola_vaccine_free.jpg?fit=860%2C460&ssl=1)
COLD STORAGE An Ebola vaccine tested in West Africa is stored at –80° C in a canister that researchers can take out into the field. More than 5,000 people in Guinea received the vaccine in a trial to gauge its efficacy.
S. Hawkey/WHO