= Covid19 =
 * https://www.infarmed.pt/web/infarmed/testes-covid-19
 * https://www.ecdc.europa.eu/sites/default/files/documents/Objectives-of-vaccination-strategies-against-COVID-19.pdf

== EU certificate ==
 * https://ec.europa.eu/info/live-work-travel-eu/coronavirus-response/safe-covid-19-vaccines-europeans/eu-digital-covid-certificate_en
 * https://www.europarl.europa.eu/RegData/etudes/BRIE/2021/690618/EPRS_BRI(2021)690618_EN.pdf
 * There  are  currently  four  Covid-19  vaccines  that  have received conditional   marketing   authorisation   in   the   EU   (Pfizer-BioNTech,   Moderna,   AstraZeneca  and  Janssen);
 * In a January  2021  resolution, the Parliamentary Assembly of the Council of Europe emphasised that states must 'ensure that no one  is  discriminated  against  for  not  having  been  vaccinated,  due  to  possible  health  risks  or  not  wanting to be vaccinated'. 
 * For  example,  it  is  argued  that,  since  'vaccination  is  currently not  readily  accessible  for  all,  this could  lead  to  a  two-tier  society,  with  the  vaccinated  enjoying  unrestricted  free  movement  while  others  face  restrictions  that  render  their  right  to  free  movement  difficult  or  impossible  to  exercise  in  practice'.
 * For example, the high cost of tests could place burdens on people, leading  to  what some commentators have called a 'free movement tax'. In particular when proof of tests are required for other purposes, such as accessing public services, the associated costs of testing could constitute a violation of human rights.  
 * Although this may be a national competence, cases where Member States do not reimburse such tests or pay for them directly might constitute a violation of human rights; in particular where the tests are required for other purposes, since they then become essential services in the meaning of Article 20 of the European Pillar on Social Rights.
 * The  proposed  certificate  is  considered  a  temporary  measure.  According  to  the  Commission's proposal,  the  certificate  will  be  suspended  once  the  WHO  declares  the  end  of  the  Covid-19 international  health  emergency.
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