Do an abstractive summarization for this: "The first vaccine for Ebola was approved by the FDA in 2019 in the US, five years after the initial outbreak in 2014. To produce the vaccine, scientists had to sequence the DNA of Ebola, then identify possible vaccines, and finally show successful clinical trials. Scientists say a vaccine for COVID- 19 is unlikely to be ready this year, although clinical trials have already started." Write your response using less than 100 words.
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