(Bloomberg) -- Johnson & Johnson started a trial of its experimental Ebola vaccine in the U.K. and said it will produce 2 million courses of the shot this year.

The first volunteers in Oxford have received an initial dose, and the trial aims to recruit 72 people by the end of January, the New Brunswick, New Jersey-based company said in a statement today. Other tests are planned for the U.S., Kenya, Uganda and Tanzania. J&J has produced more than 400,000 courses of vaccine for use in large-scale trials by April, and could produce as many as 5 million courses over 12 to 18 months.

Drugmakers are racing to develop a protective vaccine against Ebola to curb the outbreak that has struck more than 20,000 people and killed more than 8,000, according to the World Health Organization. While the epidemic has stabilized in Liberia and Guinea, transmission remains intense in Sierra Leone, where more than 300 new infections were diagnosed in the last week of the year.

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