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Actually Hong Kong vaccines were about half Pfizer and half Sinovac. The low vaccination rate is the main problem. This article about reasons for that low vacc

• makomk 5y ago
  Hong Kong has a worse vaccination rate amongst the elderly and better vaccine mix than the mainland (more imported vaccines, probably less of the more dubious Chinese-made ones), but broadly speaking they're very similar. I think even the Western countries with comparatively poor vaccination rates are still better than either.