COVID-19 Vaccine Passport

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

A COVID-19 Vaccine Passport (also known by many other names in different jurisdictions)[1] is a verifiable record of immunization certifying an individual has received a COVID-19 vaccine. This portable record of the bearer's vaccination status may be in either paper or digital form, such as in a mobile phone app. In either case it will usually contain a scannable barcode.

It is vitally important that a COVID-19 Vaccine Passport be verifiable[2] since it may then allow preferential and differentiated access to businesses, events, services and travel.[3] This verifiability distinguishes a COVID-19 Vaccine Passport from a mere COVID-19 vaccine card. COVID-19 Vaccine Passports are also distinguishable from immunity passports or certificates or health passes which may certify immunity acquired by a variety of routes other than vaccination.

During the COVID-19 pandemic, passports were seen as a potential way to contain the pandemic and permit faster economic recovery.[4] Despite the benefits of vaccination in ameliorating economic and social problems caused by the pandemic, issuing COVID-19 vaccine passports has raised scientific, ethical and legal issues.[5] Critics have argued that tests to detect the virus are unreliable and that the vaccines themselves do not confer immunity from infection or prevent viral transmission. Critics also argue that immunity passports violate civil liberties and are likely to result in a two-tiered or segregated society.

In some jurisdictions such as France, Italy and Canada where vaccine passports were introduced for COVID-19, vaccine uptake increased.[6][7][8][9][10]

History and background[edit]

Many governments including Finland[11] and Germany[12]have expressed early interest in the concept. In February 2021, Israel implemented a "green pass" system, which allowed those who are fully vaccinated to eat at restaurants, attend concerts, and travel to other nations such as Egypt, Cyprus and Greece.[13]

By region[edit]

Share of people who have received at least one dose of a COVID-19 vaccine relative to a country's total population. Date is at the bottom of the map.

Brazil[edit]

In December 2020, the Brazilian Senate approved a document giving digital proof of all vaccinations - not just those in respect of COVID-19. However, the urgency for creating such a digital proof of vaccination came from the COVID-19 pandemic.[14]

Canada[edit]

As of 18 September 2021, all provinces in Canada (with the exception of the territories) have announced plans[15] or have already implemented a provincial COVID-19 vaccine passport.[16][17][18][19][20][21]

China[edit]

In February 2020, China started to use digital "health codes", available on a variety of platforms including WeChat and Alipay with scannable QR barcodes displaying a "traffic light" system of colours to enter public transport, shops, restaurants and malls. It was used 40 billion times between February and March.[22]

In March 2021, an "International Travel Health Certificate" was created.[23] In March 2021,[24] the government of China rolled out the world's first[25] COVID-19 vaccine passport system through a partnership[22] with Alipay and WeChat. The system provides a health certificate that includes an individual's vaccine status and the results of COVID-19 testing.[22][25][24] Initially, the system would only indicate that an individual had been vaccinated if they received a Chinese-made coronavirus vaccine, leading to criticism, though by April 2021 the system began to accept records of receiving the Pfizer-BioNTech, Moderna, and Janssen vaccines.[26] As of March 2021, the app was optional and its use was restricted to Chinese citizens.[22] The digital health passport is intended to better facilitate travel.[27][22] Privacy advocates and Chinese netizens have expressed concerns regarding the potential invasive data collection and the use of data for non-health monitoring purposes.[22][28]

EU[edit]

On 8 July 2021, the EU commission decided to accept Swiss COVID vaccine certificates, making them applicable in the entire Schengen area.[29]

Some EU countries, such as Hungary, started to recognize digital vaccine passports from outside of the EU, including from Kazakhstan. However, those certificates are not applicable in the Schengen area.[30]

Ireland[edit]

In July 2021, Ireland introduced a vaccine certificate program which allowed vaccinated individuals to attend cafes, bars and restaurants. Due to one of the highest uptakes of COVID-19 vaccines in the world, the Republic of Ireland (but not Northern Ireland) has plans to retire their vaccine passport program on 22 October 2021.[31]

Japan vaccine passport[edit]

On 19 July 2021, Japan began accepting applications for its COVID-19 vaccination passport program. When issued, the passports will be in paper form in both Japanese and English, showing the holder's date(s) of inoculation and the vaccine type, and are available free of charge.[32] As of 22 July 2021, Japan vaccine passport holders are exempt from entry restrictions in Austria, Bulgaria, Italy, Poland, and Turkey. South Korea will also exempt those travelling for specific business, academic, or humanitarian reasons. Entry is also facilitated by Germany, Honduras, Hong Kong, Lithuania, St. Kitts and Nevis, St. Vincent and the Grenadines, and Thailand's islands of Phuket, Samui, Ko Pha-Ngan, and Ko Tao.[33] Japan is in negotiation with other countries (including China and the United States) to accept the passport.[32]

Switzerland[edit]

Showing ID may not be required to attend a vaccination appointment but other checks could be in effect.

UK[edit]

An NHS Covid Pass exists in England,[34] Scotland,[35] and Wales,[36] but these are immunity passports rather than true COVID-19 Vaccination Passports since

  1. they do not allow easy verification by other countries
  2. they can be issued as result of a negative test or recovery from infection

(as opposed to being purely a verified vaccination record).

The Department of Health has introduced an automated method for Northern Irish citizens who have received both their COVID-19 vaccinations in Northern Ireland to apply for COVID vaccination certification.[37]

United States[edit]

Map showing (1) California, Hawaii, Illinois, Louisiana, New Jersey, New York, North Carolina, and Virginia have implemented COVID-19 vaccine passports; (2) Alabama, Arizona, Florida, Idaho, Indiana, Iowa, Montana, North Dakota, South Carolina, South Dakota, Texas, and Wyoming have banned COVID-19 passports; (3) that Alaska, Arkansas, Georgia, Missouri, New Hampshire, Oklahoma, Tennessee, and Utah have partially banned COVID-19 vaccine passports; (4) that Washington has a significant locality that has implemented a COVID-19 passport
A map showing which US states have implemented (green), banned (red), or partially banned (yellow) COVID-19 vaccine passports. Gray indicates that the state has neither implemented or banned COVID-19 vaccine passports. Also included is states that have significant localities with COVID-19 vaccine passports (Aqua). [38][39][40][41][42][43]

As of September 2021, the United States of America has not issued a digital COVID vaccine certificate either for domestic use or for travel abroad. Persons who are vaccinated in the US are issued a COVID-19 Vaccination Record Card by the CDC. However, those cards are easily forged and do not bear a copy-proof QR code nor a digital signature. Acceptance of CDC cards by other countries is not a given. In June 2021, a spokesperson for the EU pointed out that fully vaccinated Americans entering a Schengen nation could present proof of vaccination or negative test to the health authority of the host nation, which in turn could issue a digital EU COVID vaccine certificate. A number of US airlines have also encouraged passengers to upload health information before boarding a plane to a foreign destination. Digitally issued vaccine certificates have been internationally criticised due to privacy concerns, inequitable access and inconsistent acceptance of different vaccine types.[44]

Marjorie Taylor Greene, a newly elected Republican US Representative for Georgia, told her supporters on Facebook in early April 2021 that "something called a vaccine passport" was a form of "corporate communism" and part of the US Democratic Party effort to control people's lives.[45] However, a representative survey of the U.S. population showed that, prior to the issue becoming politicized, public views on vaccination passports were evenly split and the divide crossed, rather than followed, political and ideological lines.[46]

On 15 March 2021, Andy Slavitt, a White House senior adviser for COVID-19 response, said regarding the development of processes to verify COVID-19 vaccinations that: "It should be private. The data should be secure. Access to it should be free. It should be available both digitally and in paper and in multiple languages. And it should be open source". He added that "It's not the role of the [US federal] government to hold that data and to do that".[47] Later, on 6 April 2021, an announcement was made that the US federal government would not introduce mandatory vaccine passports, citing privacy and human rights concerns.[47]

The state governments of California, New York, and North Carolina have each rolled out mechanisms whereby residents can choose to receive proof of COVID-19 vaccination in the form of a scannable QR code by linking to records within each state's immunization registry. Virginia and Hawaii were developing similar QR-based vaccination passports as of August 2021. Each state pass has varying degrees of interoperability with other state and foreign governments; some states have closed systems, with QR codes that are only usable within the issuing state, and others have broad interoperability, with New York offering both types of passes for its residents.[48][49][50][51][52] Arizona, Louisiana, Maryland, Mississippi, North Dakota, Washington, West Virginia, Puerto Rico, and the District of Columbia have contracted with an organization that interfaces with governmental vaccination records to produce a PDF proof of vaccination, yet this firm has also moved toward scannable QR codes. Health departments in Indiana, Colorado, and Georgia can provide proof of vaccination in PDF form but not via a QR code.[53][54][55][56]

Arguments and controversy[edit]

Several US states, including South Dakota, Montana, Idaho, Utah, Florida, Texas and Arizona,[57] have banned the use of COVID-19 vaccination passports.[58][59]

In April 2021, the World Health Organization (WHO) advised against the use of mandatory COVID-19 vaccine passports for travel, citing ethics and efficacy concerns.[60][61][62] In February 2021, the position of World Health Organization (WHO) on requiring proofs of COVID-19 vaccination for international travel purposes remains against on using this as a condition for departure or entry. [63]

Reliability and quality of tests[edit]

The extent of protection of a vaccine for emerging new variants of COVID-19 is not yet well understood.[64] To encourage a reasonable policy approach to the scientific reliability of tests, the World Health Organization (WHO) recommended that there should be an established minimum duration of immunity, reliable indicators of concentration and quantity of antibodys, and accurate availability of tests to ensure that the results are within satisfactory levels. The setting of the threshold of tolerable error should be a responsibility of the government, not private companies to avoid conflicts of interest.[5]

Ethical and social issues[edit]

The ethical issues that arise in the acceptability of vaccine passports revolve around the policy objectives and the intended use.[5] The public health restriction on implementing vaccine passports limits the freedom of an individual to perform social activities.[64] For people who are concerned about the economy and business, issuing vaccine passports would be beneficial because it prevents the severe consequences of a recession.

Vandalism in Toronto (2021)

Existing social disparities in society are likely to be affected by imposing COVID-19 vaccination passports. People who are privileged to receive the vaccination will have gained access to going back to normal life while low-income populations will remain disproportionately low on vaccinations which hinders their social privilege to go out.[64] Religious people and people who refuse to get vaccinated have also restricted their own liberties.[64]

International standards[edit]

The Royal Society published a report on 19 February 2021[65] where a lead author of the report, Professor Melinda Mills, Director of the Leverhulme Centre for Demographic Science at the University of Oxford said: “Understanding what a vaccine passport could be used for is a fundamental question – is it literally a passport to allow international travel or could it be used domestically to allow holders greater freedoms? The intended use will have significant implications across a wide range of legal and ethical issues that need to be fully explored and could inadvertently discriminate or exacerbate existing inequalities.” The report lists 12 essential criteria for an international standard.

On 12 March 2021, Ecma International announced its intention to create an international standard which prevents counterfeits and protects private data as much as possible in a "Call for Participation on Vaccine Passports International Standardization" [66] that referenced the earlier report from the UK's Royal Society. In August 2021, Ecma International announced revisions to Ecma-417 (Architectures for distributed real-time access systems) relevant to standards for vaccine passports. [67]

Vaccination certificates[edit]

Ethics[edit]

Due to the imbalance in the distribution of vaccines in the developing world, there are concerns about the inequity of vaccine passports for travellers. In a 15 April 2021 meeting published 4 days later, the World Health Organisation’s emergency committee opposed vaccination passports, saying "States Parties are strongly encouraged to acknowledge the potential for requirements of proof of vaccination to deepen inequities and promote differential freedom of movement".[68]

However, many countries may increasingly consider the vaccination status of travellers when deciding to allow them entry or whether to require them to quarantine. “Some sort of vaccine certificate will be important” to reboot travel and tourism, according to Dr David Nabarro, special envoy on COVID-19 for the World Health Organization (WHO), in February 2021.[69] Countries experimenting with or seriously considering COVID-19 vaccination passports include Aruba,[70] Britain,[71] Israel[72] and Canada.[73]

In March 2021, Bernardo Mariano, the WHO's Director of Digital Health and Innovation, said that "We don't approve the fact that a vaccination passport should be a condition for travel."[74] Lawmakers in several US states are also considering legislation to prohibit COVID-19 vaccination passports.[75]

As of 4 April 2021, it is not yet clear whether vaccinated people that remain asymptomatic are still contagious and are thus silent spreaders of the virus putting unvaccinated people at risk. "A lot of people are thinking that once they get vaccinated, they’re not going to have to wear masks any more," said Michal Tal, an immunologist at Stanford University. "It’s really going to be critical for them to know if they have to keep wearing masks, because they could still be contagious."[76]

References[edit]

  1. ^ "Explained: Are immunity passports, release certificates the way to go?". indianexpress.com. 10 May 2020.
  2. ^ CST Editorial Board (17 August 2021). "Americans need a better vaccination ID than a flimsy piece of paper". CNN.
  3. ^ Amaro, Silvia (17 September 2021). "Italy makes Covid passports mandatory for all employees". CNBC. CNBC LLC. Retrieved 18 September 2021.
  4. ^ Chotani RA, Ashraf SS, Mize C, Clark T (30 April 2020). "'Immunity passport' key to containing spread of coronavirus". UPI. Retrieved 1 May 2020.
  5. ^ a b c Voo TC, Reis AA, Thomé B, Ho CW, Tam CC, Kelly-Cirino C, et al. (February 2021). "Immunity certification for COVID-19: ethical considerations". Bulletin of the World Health Organization. 99 (2): 155–161. doi:10.2471/blt.20.280701. PMC 7856365. PMID 33551509.
  6. ^ Hart, Robert. "Vaccine Passports Spur Explosion In Vaccinations—And Protests—As Europe Cracks Down On Vaccine Holdouts". Forbes.
  7. ^ "With vaccine passports around the corner, Niagara sees increase in vaccination appointments; 55 new COVID cases Sunday". stcatharinesstandard.com. 4 September 2021.
  8. ^ "New vaccine passport system leads to increase in first-dose appointments". BarrieToday.com.
  9. ^ "B.C. sees big boost in bookings after announcing vaccine passport program | Globalnews.ca". Global News.
  10. ^ https://www.cbc.ca/news/canada/windsor/windsor-regional-hospital-vaccine-certificate-1.6163530
  11. ^ Mutanen A. "Suomalaiset tutkijat kehittivät vasta-ainetestin, joka paljastaa, kuka on jo sairastanut koronaviruksen". Helsingin Sanomat (in Finnish). Retrieved 1 May 2020.
  12. ^ Day, Joel (1 April 2020). "Coronavirus breakthrough: Germany roll outs promising antibody test to end lockdown". Daily Express. Retrieved 1 May 2020.
  13. ^ "Israel's dilemma: Can the unvaccinated return to workplaces?". AP NEWS. 2 April 2021. Retrieved 4 April 2021.
  14. ^ "Brazilian Senate approves new, digital vaccination card". The Brazilian Report. 16 December 2020.
  15. ^ "Alberta to launch proof-of-vaccination program, declares health emergency amid surge in COVID-19 cases". CBC News. 15 September 2021. Retrieved 18 September 2021.
  16. ^ https://www.cbc.ca/news/canada/prince-edward-island/public-health-new-rules-1.6179109
  17. ^ "B.C. launches proof of vaccination to stop spread of COVID-19 | BC Gov News". news.gov.bc.ca. 23 August 2021.
  18. ^ "Province of Manitoba | News Releases | Manitoba Expands Vaccine Passports for Fully Immunized Individuals as of Sept. 3". Province of Manitoba.
  19. ^ https://www.cbc.ca/news/canada/newfoundland-labrador/covid-nl-sept-7-2021-1.6166699
  20. ^ "Nova Scotia to move into Phase 5 on Sept. 15, announces proof of vaccination policy". Atlantic. 8 September 2021.
  21. ^ "Ontario reveals vaccine passport system for restaurants, gyms and theatres. Here's what you need to know". Toronto. 1 September 2021.
  22. ^ a b c d e f Cockerell I (12 March 2021). "China's new vaccine passport could expand the state's already vast surveillance program". Coda Story.
  23. ^ "China's Digital Health Certificates —".
  24. ^ a b Liu R, Munroe T (9 March 2021). "China launches COVID-19 vaccine passport for cross-border travel". Global News. Reuters.
  25. ^ a b "China introduces world's first 'virus passport' programme". France 24. Agence France-Presse. 10 March 2021.
  26. ^ Duo E (20 April 2021). "China to recognize Western shots for its vaccine passports, as it seeks to reopen". The Washington Post.
  27. ^ Gan N, Griffiths J (21 April 2021). "China's vaccine nationalism softens as country signals it may approve foreign-made shots". CNN.
  28. ^ Davidson H, Wu PL (1 April 2020). "China's coronavirus health code apps raise concerns over privacy". The Guardian.
  29. ^ "Grünes Licht für Schweizer Covid-Zertifikat" (in German). blick.ch. Retrieved 8 July 2021.
  30. ^ "Hungary Becomes First Country in Eu to Recognize Kazakhstan's Vaccination Passports". Business Media Georgia.
  31. ^ https://www.reuters.com/world/europe/ireland-drop-almost-all-covid-19-restrictions-october-2021-08-31/ 'From 22 October 2021 the requirement for vaccine certificates in bars and restaurants will be dropped, as will all restrictions on the numbers attending indoor and outdoor events. As part of a phased easing of restrictions, the government is recommending the reopening of theatres and cinemas at 60% capacity next week and a return of non-essential workers to offices from 20 September 2021. "Because of the effort of our vaccination team and because you have stepped up to the mark and taken the vaccine when it was offered, we are now entering a whole new phase of the pandemic," Martin said in a televised address. Almost 90% of adults in Ireland are fully vaccinated as are 80% of over those over 12 years old.'
  32. ^ a b Osumi, Magdalena (22 July 2021). "Japan's vaccine passports: Here's what you need to know". The Japan Times. Retrieved 8 August 2021.
  33. ^ "Germany and Hong Kong now recognize Japan's vaccine passports". 3 August 2021.
  34. ^ "NHS COVID Pass". NHS. 21 June 2021. Retrieved 19 August 2021.
  35. ^ "Get a record of your coronavirus (COVID-19) vaccination status". NHS Inform. Retrieved 19 August 2021.
  36. ^ "Get the NHS COVID Pass to show your vaccination status for travel". Welsh Government. Retrieved 19 August 2021.
  37. ^ "Coronavirus (COVID-19): COVID certificate for NI residents". nidirect. 15 July 2021. Retrieved 19 August 2021.
  38. ^ Davis E. "These States Have Banned Vaccine Passports".
  39. ^ Mlot S (29 March 2021). "New York Launches First Digital COVID-19 Vaccine Passport". PC Magazine.
  40. ^ Lonas L (14 April 2021). "Tennessee Senate passes ban on government issued 'vaccine passports'". The Hill.
  41. ^ Sameuls I (14 April 2021). "Governor bans use of vaccine passports in Montana". Associated Press.
  42. ^ "Utah law blocks government agencies from requiring COVID-19 Vaccines". Salt Lake Tribune. 6 April 2021.
  43. ^ "Texas governor bans mandated COVID-19 "vaccine passports"". CBS News. 7 April 2021.
  44. ^ Fox A (3 June 2021). "Americans May Be Able to Obtain the EU's Digital COVID Certificate for Travel". Travel&Leisure. Retrieved 8 July 2021.
  45. ^ "Vaccine passports are latest flash point in Covid politics". New Zealand Herald. NZME Publishing Limited. 4 April 2021. Retrieved 4 April 2021.
  46. ^ Hall MA, Studdert DM (31 March 2021). "Public Views about COVID-19 "Immunity Passports"". medRxiv: 2021.01.26.21250184. doi:10.1101/2021.01.26.21250184. S2CID 231719316.
  47. ^ a b "Covid: US rules out federal vaccine passports". BBC News. 6 April 2021. Retrieved 7 April 2021.
  48. ^ Prodis Sulek, Julia; Harrington, Jim (19 August 2021). "Another step toward COVID vaccine passport? California, San Francisco, San Jose gear up for new mandates". The Mercury News. Archived from the original on 19 August 2021. Retrieved 22 August 2021.
  49. ^ Bursztynsky, Jessica (4 August 2021). "How to get New York's Excelsior Pass so you can show your proof of vaccination from your phone". CNBC. Archived from the original on 4 August 2021. Retrieved 22 August 2021.
  50. ^ Littlehales, Alex (17 August 2021). "Digital Vaccine Cards: How to get them in Virginia, North Carolina". WVEC TV 13. Archived from the original on 18 August 2021. Retrieved 22 August 2021.
  51. ^ "Governor Cuomo Announces Launch of Excelsior Pass Plus to Support the Safe, Secure Return of Tourism and Business Travel". Governor’s Press Office - Governor Andrew M. Cuomo. 5 August 2021. Archived from the original on 5 August 2021. Retrieved 22 August 2021.
  52. ^ "Lt. Gov. Green: Hawaii looking at requiring proof of vaccination for indoor activities". KHNL/KGMB Hawaii News Now. 20 August 2021. Archived from the original on 21 August 2021. Retrieved 22 August 2021.
  53. ^ "LA Wallet app will let you have digital copy of COVID-19 vaccine card". WDSU 6 News. 5 May 2021. Archived from the original on 5 May 2021. Retrieved 22 August 2021.
  54. ^ "MyIR Mobile". Archived from the original on 23 August 2021. Retrieved 23 August 2021.
  55. ^ Rowan Kelleher, Suzanne (28 July 2021). "5 Ways To Get Digital Proof Of Covid Vaccination Status—Even If You Live In A Red State". Forbes. Archived from the original on 28 July 2021. Retrieved 23 August 2021.
  56. ^ Cipriani, Jason (22 August 2021). "Stop carrying around your vaccination card. Here's how to keep a digital copy on your phone". CNET. Archived from the original on 22 August 2021. Retrieved 23 August 2021.
  57. ^ Porterfield C (13 April 2021). "Arizona Becomes Sixth State To Ban Coronavirus Vaccine Passports — See The Full List Here". Forbes. Retrieved 22 April 2021.
  58. ^ Atkins C (21 April 2021). "These states are attempting to ban or curtail 'vaccine passports'". NBC News. Retrieved 22 April 2021.
  59. ^ Wargo A (21 April 2021). "Gov. Noem issues executive order banning vaccine passports in state". Rapid City Journal. Retrieved 22 April 2021.
  60. ^ Miles F (9 March 2020). "China issues 'world-first' COVID-19 vaccine passport in boost for travel". Fox News. Associated Press.
  61. ^ Weixel N (6 April 2021). "WHO does not support mandatory 'vaccine passports'". The Hill.
  62. ^ "WHO does not back vaccination passports for now - spokeswoman". Reuters. 6 April 2021.
  63. ^ "Interim position paper: considerations regarding proof of COVID-19 vaccination for international travellers". www.who.int. Retrieved 20 July 2021.
  64. ^ a b c d Hall MA, Studdert DM (March 2021). ""Vaccine Passport" Certification - Policy and Ethical Considerations". The New England Journal of Medicine. 385 (11): NEJMp2104289. doi:10.1056/NEJMp2104289. PMID 33789006.
  65. ^ "12 challenges for vaccine passports". The Royal Society. 19 February 2021. Retrieved 22 August 2021.
  66. ^ "Call for participation on vaccine passport international standardization". Ecma International. 12 April 2021.
  67. ^ "Standard on vaccine passport" (PDF). Ecma International. 9 August 2021.
  68. ^ "WHO says against proof of Covid-19 vaccination for international travel". South China Morning Post. 20 April 2021.
  69. ^ Hainey R, Otter S (15 February 2021). "Coronavirus LIVE updates with government lockdown review underway". Manchester Evening News. Retrieved 17 April 2021.
  70. ^ Landler M (9 April 2021). "Vaccine Passports Could Unlock World Travel and Cries of Discrimination". The New York Times. ISSN 0362-4331. Retrieved 17 April 2021.
  71. ^ "What are the UK plans for Covid passports?". BBC News. 6 April 2021. Retrieved 17 April 2021.
  72. ^ Ferguson C, Mitnick J (1 March 2021). "Israel's "green pass" vaccine passport is an early vision of how we leave lockdown". MIT Technology Review. Retrieved 17 April 2021.
  73. ^ "COVID-19 Immunity Status and Considerations for Public Health Measures" (PDF). Public Health Ontario. 18 March 2021.
  74. ^ Josephs J (20 March 2021). "Qantas boss: Governments 'to insist' on vaccines for flying". BBC. Retrieved 21 March 2021.
  75. ^ "Vaccine passports are latest flash point in Covid politics". New Zealand Herald. NZME Publishing Limited. 4 April 2021. Retrieved 4 April 2021.
  76. ^ Mandavilli A (8 December 2020). "Here's Why Vaccinated People Still Need to Wear a Mask". The New York Times. Retrieved 4 April 2021.

See also[edit]