Presidential spokesperson Harry Roque (OPS / FILE PHOTO / MANILA BULLETIN) In his remarks during the ceremonial vaccination of members of the A4 priority group in Pasay City, Roque explained why it would be difficult to implement the same rules to Filipinos who were vaccinated overseas. “Wala pa po tayong kasunduan sa buong daigdig kung pano natin mabe-verify yung authenticity ng mga vaccination card sa buong daigdig (There is no international agreement yet on how we can verify the authenticity of vaccination cards),” he said Monday. “Baka kinakailangan magkaroon ng isang international na kasunduan kung dapat magkaroon ng standard na vaccination certificate nang sa ganoon hindi po problema ang pag-authentic kung totoo o peke yung vaccination card (Perhaps we need to have an international agreement if we should have a standard certificate so we won’t have any problem in authenticating vaccination cards),” he added.