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In page Smallpox vaccine:

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MVA-BN can also be administered intradermally to increase the number of available doses.[5] It is safer for immunocompromised patients and those who are at risk from a vaccinia infection.[citation needed] MVA-BN has been approved in the European Union,[6] Canada,[7][8][9] and the United States.[10][11] Clinical trials have found that MVA-BN is safer and just as immunogenic as ACAM2000.[12][13][14] This vaccine has also been approved for use against mpox.[15][16][17]