Read the following statements carefully:
1.A second Ebola vaccine is to be offered to around 50,000 people in the Democratic Republic of Congo, as part of a major clinical trial.
2.The Johnson & Johnson vaccine will be used alongside a one-dose vaccine made by Merck, which has already been given to around 250,000 people.
3.Merck's jab has now been approved by the World Health Organization.
Which of the above statements is/are correct?