Moderna said it had shared the new finding on its vaccine with regulators and submitted it for peer review publication.
Since 2005, there have been 37 cases of swine flu in the US, WHO said, and 512 globally.
British scientists are working on a vaccine against Disease X, the hypothetical pathogen that will cause the next pandemic.
Cases of MERS-CoV - which can cause fever, coughing and shortness of breath, and in some cases can lead to pneumonia - have been recorded in 27 countries since 2012, according to WHO figures.
Some of the most popular European cities have surprisingly poor air quality.
Aspartame will be listed as "possibly carcinogenic to humans" for the first time by the International Agency for Research on Cancer, the WHO cancer research arm.
If successful, the scheme – known as the global virtual pooled inventory (GVPI) – could be a pilot for other deadly diseases and wider pandemic preparedness.
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