2002–2004 SARS outbreak

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2002–2004 SARS outbreak
SARS map.svg
A map of the infected countries of the epidemic of SARS between 1 November 2002 and 7 August 2003
  Countries with confirmed deaths
  Countries with confirmed infections
  Countries without confirmed cases
Sars Cases and Deaths.pdf
A map of SARS cases and deaths around the world regarding the global population
Virus strainSARS-CoV
First outbreakShunde, Guangdong, China
Index case16 November 2002
Confirmed cases8,096
2003 Probable cases of SARS - Worldwide

The 2002–2004 SARS outbreak was an epidemic involving severe acute respiratory syndrome (SARS) caused by SARS-CoV. The outbreak was first identified in Foshan, Guangdong, China in November 2002. Over 8,000 people from 29 different countries and territories were infected, and at least 774 died worldwide.[1] The World Health Organization declared severe acute respiratory syndrome contained on 5 July 2003, however several SARS cases were reported until May 2004.[2]

Outbreak by country and territory

Probable cases of SARS by country and territory,
1 November 2002 – 31 July 2003[3]
Country or region Cases Deaths Fatality (%)
 China[a] 5,327 349 6.6
 Hong Kong 1,755 299 17.0
 Taiwan[b] 346 73[4][5] 21.1
 Canada 251 43 17.1
 Singapore 238 33 13.9
 Vietnam 63 5 7.9
 United States 27 0 0
 Philippines 14 2 14.3
 Thailand 9 2 22.2
 Germany 9 0 0
 Mongolia 9 0 0
 France 7 1 14.3
 Australia 6 0 0
 Malaysia 5 2 40.0
 Sweden 5 0 0
 United Kingdom 4 0 0
 Italy 4 0 0
 India 3 0 0
 South Korea 3 0 0
 Indonesia 2 0 0
 South Africa 1 1 100.0
 Kuwait 1 0 0
 Ireland 1 0 0
 Macau 1 0 0
 New Zealand 1 0 0
 Romania 1 0 0
 Russia 1 0 0
 Spain 1 0 0
  Switzerland 1 0 0
Total excluding China 2,769 454 16.4
Total (29 territories) 8,096 774 9.6
  1. ^ Figures for China exclude Hong Kong, Macau and Taiwan, which are reported separately by the WHO.
  2. ^ After 11 July 2003, 325 Taiwanese cases were 'discarded'. Laboratory information was insufficient or incomplete for 135 of the discarded cases; 101 of these patients died.


November 2002

On 16 November 2002, an outbreak of severe acute respiratory syndrome (SARS) began in China's Guangdong province, bordering Hong Kong. A farmer in the Shunde district of Foshan County was likely the first case of infection. The People's Republic of China notified the World Health Organization (WHO) about this outbreak on 10 February 2003, reporting 305 cases including 105 health-care workers and five deaths.[6] Later it reported that the outbreak in Guangdong had peaked in mid-February 2003. However, this appears to have been false because subsequently 806 cases of infection and 34 deaths were reported.[7]

Early in the epidemic, the Chinese Government discouraged its press from reporting on SARS, delayed reporting to WHO, and initially did not provide information to Chinese outside Guangdong province, where the disease is believed to have originated.[8] Also, a WHO team that travelled to Beijing was not allowed to visit Guangdong province for several weeks.[9] This resulted in international criticism, which seems to have led to a change in Government policy in early April.

January 2003

The first super-spreader, Zhou Zuofen, a fishmonger, checked in to the Sun Yat-sen Memorial Hospital in Guangzhou on 31 January, where he infected 30 nurses and doctors. The virus soon spread to nearby hospitals.[10]

February 2003

Hong Kong

Ninth floor layout of the Hotel Metropole in Hong Kong, showing where a super-spreading event of the severe acute respiratory syndrome (SARS) occurred

In February 2003, Hong Kong's SARS index-patient was Dr. Liu Jianlun, who had come to attend a family wedding gathering; Dr. Liu was on the staff at Sun Yat-Sen Memorial Hospital in Guangdong and had treated SARS patients.[11]

On 21 February, Dr. Liu and his wife checked into room 911 on the 9th floor of the Metropole Hotel. Despite feeling ill he visited with his family and they traveled around Hong Kong. By the morning of 22 February, he knew he was very sick and walked to nearby Kwong Wah Hospital to seek treatment. He warned staff that he was very sick and to put him in isolation. He never recovered and died in the Intensive Care Unit on 4 March.

Dr. Liu is believed to have been a SARS super-spreader: twenty-three other Metropole guests developed SARS, including seven from the ninth floor. Liu's brother-in-law, who sought treatment in late February, was hospitalized in Kwong Wah Hospital on 1 March and died on 19 March. It is estimated that around 80% of the Hong Kong cases were due to Liu.[12]


The virus was carried to Hanoi, Vietnam by Chinese-American Johnny Chen, a resident of Shanghai who had roomed across the hall from Liu at the Metropole. He was admitted to the French Hospital of Hanoi on 26 February, where he infected at least 38 members of the staff. Even though he was evacuated to Hong Kong, he died on 13 March.[12]

Dr. Carlo Urbani, a WHO infectious disease specialist, was among the staff who examined Chen. Urbani observed that other hospital staff were already falling ill and realized that he was dealing with a new and dangerous disease. He himself became infected and died on 29 March.[12]


On 23 February, an elderly woman named Kwan Sui-Chu who had also been a Metropole Hotel guest, returned to Toronto from Hong Kong. She died at home on 5 March, after infecting her son Tse Chi Kwai, who subsequently spread the disease to Scarborough Grace Hospital and died on 13 March.[13]


On 25 February, a businessman who had traveled to Hong Kong and Guangdong Province returned home to Taipei, marking the beginning of the outbreak on Taiwan. Almost all of those infected were either medical staff or family members of persons who had fallen ill. It is believed[by whom?] that the affected medical staff were unaware of the risks and were not using respiratory precautions such as masks, a safety protocol intended to protect medical workers from highly contagious diseases.

March 2003


On 1 March 26-year-old Esther Mok, another Metropole guest, was admitted to Tan Tock Seng Hospital after visiting Hong Kong, starting the outbreak in Singapore. Although she recovered, various family members did not.[14]

Hong Kong

On 4 March, a 27-year-old man, who had visited a guest on the Metropole's 9th floor 11 days earlier, was admitted to Hong Kong's Prince of Wales Hospital. At least 99 hospital workers (including 17 medical students) were infected while treating him.[15]


On 11 March, Dr. Carlo Urbani travelled to Bangkok, Thailand to attend a medical conference. He fell ill during the flight and told a friend waiting at Bangkok not to touch him, to call an ambulance and take him to a hospital. He was isolated in an Intensive Care Unit.

A similar outbreak of a mysterious respiratory infection was reported among Hong Kong healthcare workers.

On 12 March, WHO issued a global alert about a new infectious disease of unknown origin in both Vietnam and Hong Kong.

On 15 March, WHO issued a heightened global health alert about a mysterious pneumonia with a case definition of SARS after cases in Singapore and Canada were also identified. The alert included a rare emergency travel advisory to international travelers, healthcare professionals, and health authorities.

The Center for Disease Control (CDC) issued a travel advisory stating that persons considering travel to the affected areas in Asia (Hong Kong, Singapore, Vietnam, and China) should not go.

On 17 March, an international network of 11 laboratories was established to determine the cause of SARS and develop potential treatments.

The CDC held its first briefing on SARS and said that 14 suspected SARS cases were being investigated in the US.

On 20 March, WHO reported that several hospitals in Vietnam and Hong Kong were operating with half the usual staff because many workers stayed home out of fear of getting infected. WHO raised the concern that substandard care of the infected patients might contribute to the spread of the disease.

On 25 March, Hong Kong authorities stated that nine tourists had contracted the disease from a mainland Chinese man who had boarded the same plane on 15 March, Air China Flight 112 to Beijing.[16] SARS started to hit Amoy Gardens Block E heavily.

The Singapore Government started to enforce compulsory quarantine of any infected person.

On 27 March, Arthur K. C. Li, head of the Hong Kong Education and Manpower Bureau, announced cancellation of all classes in educational institutions. The Ministry of Education of Singapore announced that all primary schools, secondary schools, and junior colleges were to be shut until 6 April 2003. Polytechnics and universities were not affected.[17]

On 29 March, Dr. Urbani died in Bangkok of a massive heart attack.

On 30 March, Hong Kong authorities quarantined estate E of the Amoy Gardens housing estate due to a massive (200+ cases) outbreak in the building. The balcony was completely closed and guarded by the police. The residents of the building were later transferred to the quarantined Lei Yue Mun Holiday Camp and Lady MacLehose Holiday Village on 1 April because the building was deemed a health hazard.

Most of the cases were linked to apartments with a north-western orientation which shared the same sewage pipe. According to government officials, the virus was brought into the estate by an infected kidney patient (the type of kidney illness was not specified) after discharge from Prince of Wales Hospital, who visited his elder brother living on the seventh floor. Through excretion, the virus spread through drainage. One theory speculated that the virus was spread by airborne transmission, through dried up U-shaped P-traps in the drainage system which a maritime breeze blew into the estate's balconies and stairwell ventilation. It was confirmed that the virus spread via droplets, but this later outbreak made officials question the possibility that the virus could be spread through the air.

April 2003

On 1 April, the U.S. government called back non-essential personnel in their consulate office in Hong Kong and Guangzhou. The US government also advised US citizens not to travel to the region.

On 2 April, Chinese medical officials began reporting the status of the SARS outbreak. China's southern Guangdong province reported 361 new infections and 9 new deaths, increasing the total Mainland China figures previously reported at end-February. The virus was also detected in Beijing and Shanghai. The WHO also advised travellers to avoid Hong Kong and Guangdong during a press briefing.[18]

On 3 April, a WHO team of international scientists landed in Guangzhou from Beijing to discuss with officials, but the team was yet to inspect any suspected origin or any medical facilities on the progress of infection control. Fifteen of the quarantined Amoy Gardens residents at Lei Yue Mun Holiday Camp were relocated to the Sai Kung Outdoor Recreation Centre after an overnight protest on washroom sharing. The first medical worker infected with SARS died in Hong Kong. The doctor's daughter and infected wife survived his illness, even though the wife was also among the quarantined medical workers under intensive care. Hong Kong school closures were extended by two weeks to 21 April.

On 4 April, the WHO team inspected the first infection case in Foshan County. The male infected four people. But, he did not infect his family. A 40-year-old woman became the first local case in Shanghai. A Chinese health specialist admitted at a press conference of not informing the public early enough about the outbreak. The PRC Health Minister also claimed that the disease has been under control in most parts of mainland China. He also released the names of seven drugs which he claimed to be effective in curing SARS. WHO officials said that the information provided by the PRC about the disease has been "very detailed".[citation needed] US government enforced compulsory quarantine of an infected person.

On 5 April, the Singapore government announced that school closures would be extended. Junior colleges were to reopen on 9 April, secondary schools would reopen on 14 April and primary schools and pre-schools would reopen on 16 April.[19]

On 6 April, a SARS case was found in Manila, a person who had returned from Hong Kong.

On 8 April, SARS started to plague the Lower Ngau Tau Kok Estate near Amoy Gardens in Kowloon. Hong Kong health officials warned that SARS had spread so far domestically and abroad that it was here to stay. Nevertheless, WHO officials remained cautiously optimistic that the disease could still be contained.[20]

On 9 April, James Earl Salisbury died of SARS at a hospital in Hong Kong. An American Mormon[21] and a teacher at Shenzhen Polytechnic,[22] he had been sick for approximately one month before his death, but he was originally diagnosed with pneumonia.[23] His son Michael "Mickey" Salisbury was with him in China and also contracted the disease, but he survived it.[24] Salisbury's death led to more open admissions by the Chinese government about the spread of SARS.[25]

On 10 April, Jim Hughes, the head of infectious disease at the CDC, confirming the warnings of Hong Kong health officials, claimed that he believed that SARS could no longer be eradicated in the Far East. However, he remained hopeful that it could be prevented from spreading widely in North America.[26]

On 11 April, the World Health Organization issued a global health alert for SARS as it became clear the disease was being spread by global air travel.

On 12 April, Marco Marra, director of the Michael Smith Genome Sciences Centre, which is part of the British Columbia Cancer Agency, announced that scientists at his centre had broken the genetic code of the virus suspected of causing the disease.[27] In Toronto, three more people died of SARS, bringing the Canadian death toll to 13.

On 16 April, the WHO issued a press release stating that the coronavirus identified by a number of laboratories was the official cause of SARS. The virus was officially named the SARS virus.[28]

On 17 April, first confirmed case of SARS from India was reported.[29][30]

On 19 April, Premier of the People's Republic of China Wen Jiabao announced that there would be severe consequences for local officials who do not report SARS cases in a timely and accurate manner, signaling a major change in policy. (SARS had also been gaining prominence in the mainland Chinese media; by late April, it had jumped from virtual invisibility onto the front-page, with daily reports from all provinces on new cases and measures.)

On 20 April, Beijing's mayor Meng Xuenong and the health minister of the PRC Zhang Wenkang were replaced respectively by Wang Qishan from Hainan and the former deputy health minister Gao Qiang. They were the first two high-rank officials in the PRC to be dismissed because of the fallout of the epidemic. In the news conference chaired by Gao Qiang several hours earlier, the PRC admitted that in Beijing there were more than 300 cases, as opposed to the previous figure of only 37. One day later the figure had increased to 407. Chinese officials also admitted to major underreporting of cases, which were attributed to bureaucratic ineptitude.

On 22 April, school in Hong Kong started to reopen in stages.

On 23 April, Beijing announced that all primary and secondary schools would be closed for two weeks. A few days before, some colleges in Peking University had been closed because some students had been infected. The WHO issued travel advisories against Beijing, Toronto, and Shanxi Province.[31]

On 25 April, Taipei city government closed Taipei Municipal Hospital Hoping branch, and quarantined its 930 staff and 240 patients for 2 weeks.[32] Later, people were relocated and the building sanitized.

On 24 April, the Hong Kong Government announced an HK$11.8 billion relief package designed to assist Hong Kong's battered tourism, entertainment, retail, and catering sectors, consisting of a waiver of tourism- and transport-related license fees, and HK$1 billion allocated for tourism promotion overseas. The package also includes a salaries tax rebate and reduced rates.

On 26 April, Wu Yi was named Zhang Wenkang's replacement as PRC health minister.

On 26–27 April, Chinese authorities closed down theatres, discos, and other entertainment venues in Beijing as the death toll in Beijing continued to rise, threatening to become the worst-hit area of the country, eclipsing the Guangdong province. Authorities were bolstered by the fact that the infection rate seemed to have declined, with the Guangdong region only exporting three new infections over the weekend. The economic impact was becoming dramatic as shops, restaurants, markets, bars, universities, schools, and many other businesses had closed, while some government ministries and large state banks were working with minimal staff levels.

On 28 April, WHO declared the outbreak in Vietnam to be over as no new cases were reported for 20 days.

On 29 April, leaders of member countries of ASEAN and the PRC premier held an emergency summit in Bangkok, Thailand in order to address the SARS problem. Among the decisions made were the setting-up of a ministerial-level task force and uniform pre-departure health screening in airports.

On 30 April, the World Health Organization lifted the SARS travel warning for Toronto. The decision was made because "it is satisfied with local measures to stop the spread of SARS". Canadian officials said they would step up screenings at airports.[33]

May 2003

On 3 May, the 2003 FIFA Women's World Cup was abruptly moved to the United States due to the outbreak. China maintained its automatic qualification and later hosted the Women's World Cup 4 years later.

On 4 May, the newly infected number of people in Hong Kong dropped to a single digit.

On 19 May, the WHO Annual Meeting was held in Geneva. Hong Kong pushed for the Tourism Warning to be lifted.

On 20 May, the WHO refused to lift the Tourism Warning for Hong Kong and Guangdong.

On 23 May, after a recount of the number of SARS patients, the WHO lifted the Tourism Warning for Hong Kong and Guangdong.

On 24 May, the number of newly infected patients reached zero for in Hong Kong, the first time since the outbreak in the territory in March.

On 24 May, a new cluster of about 20 suspected patients was reported in Toronto.

By 29 May, more than 7,000 people were instructed to quarantine themselves in Canada by authorities seeking to control the potential spread of the SARS outbreak.[34]

On 31 May, Singapore was removed from WHO's list of 'Infected Areas'.

June 2003

On 23 June, Hong Kong was removed from WHO's list of 'Affected Areas', while Toronto, Beijing, and Taiwan remained.

On 27 June, the World Health Organization stated that the world population should be SARS-free within the next two to three weeks, but warned the disease could emerge in China next winter.[citation needed]

July 2003

On 5 July, WHO declared the SARS outbreak contained and removed Taiwan from the list of affected areas. There had been no new cases for 20 days although around 200 people were still hospitalized with the disease.

September 2003

On 8 Sep, Singapore announced that a post-doctoral worker in a SARS research lab in the National University of Singapore had contracted the disease while working on the West Nile virus but recovered shortly thereafter. It was suspected that the two viruses mixed while he was doing his research.

October/November 2003

The Hong Kong Harbour Fest was organized and held from 17 October to 11 November 2003 as part of an HK$1 billion program to revive the economy of Hong Kong after the SARS. It was a government underwritten event organized by InvestHK, under the auspices of the Economic Relaunch Working Group, in collaboration with the American Chamber of Commerce.

December 2003

On 10 Dec, a researcher in a SARS lab in Taiwan was found infected with SARS after returning from Singapore attending a medical conference, 74 people in Singapore were quarantined but none of them were infected.

On 27 Dec, China announced the first suspected case of SARS in six months in Guangdong in an individual who was not a SARS researcher.

January 2004

2 January: Shenzhen's bid for the 2009 Summer Universiade was cancelled, and announced a bid for the 2011 Summer Universiade by FISU.

5 January: China confirmed that the case reported in December was a case of wild source SARS. The Philippines announced a possible case in a person just returned from Hong Kong.

7 January: The Philippines announced that their possible SARS case was just pneumonia. In China, Asian palm civets were culled in markets (the civets were thought to be a reservoir for the disease).

10 January: A restaurant worker in Guangdong was confirmed as the second wild source SARS since the outbreak was contained. Guangzhou was also the site of the first case in December and was thought to be the origin of the virus in the original outbreak. Three Hong Kong television reporters who visited SARS-related sites in Guangzhou were declared free of the disease.

17 January: China announced a third case of SARS in Guangzhou. WHO officials urged more testing to bring the three recently announced cases into line with their standards; however they also announced SARS virus had been detected by a WHO team in civet cages at the restaurant where the second case worked and in civet cages in the market.

31 January: China announced the fourth case of SARS as a 40-year-old doctor from the southern city of Guangzhou, and gave his family name as Liu. He was discharged when the announcement was made.

April 2004

SARS broke out again in Beijing and in Anhui Province. On 22 April, China announced that a 53-year-old woman had died on 19 April, its first SARS death since June. One person died and nine were infected in the outbreak which was first reported on 22 April.[35] The first 2 infected cases involved a postgraduate student and a researcher at the National Institute for Viral Disease Control and Prevention (abbrev.: Institute of Virology) of the Chinese Center for Disease Control and Prevention; an additional 7 cases were diagnosed, which were linked with close personal contact with the student, the lab or with a nurse who treated the student.[36].

May 2004

1 May: Two additional confirmed cases of SARS and three additional suspected cases were reported in Beijing, all related to a single research lab, the Diarrhea Virus Laboratory in the CDC's National Institute of Virology in Beijing.[37] "The cases had been linked to experiments using live and inactive SARS coronavirus in the CDC's virology and diarrhea institutes where interdisciplinary research on the SARS virus was conducted."[38] The total number of cases was six, with four in Beijing and two in Anhui Province.

2 May: China announced the three suspected cases as genuine cases of SARS, bringing the total cases in a recent outbreak to nine. 189 people were released from quarantine.

18 May: As no new infections had been reported in a three-week period, WHO announced China as free of further cases of SARS, but "biosafety concerns remain".[2]

Subsequent status

Status of SARS as of 15 May 2005

In May 2005, Jim Yardley of the New York Times wrote:

"Not a single case of the severe acute respiratory syndrome has been reported this year [2005] or in late 2004. It is the first winter without a case since the initial outbreak in late 2002. In addition, the epidemic strain of SARS that caused at least 774 deaths worldwide by June 2003 has not been seen outside of a laboratory since then."[39]

See also



  1. ^ "How SARS terrified the world in 2003, infecting more than 8,000 people and killing 774". 20 February 2020.
  2. ^ a b WHO (18 May 2004). "China's latest SARS outbreak has been contained, but biosafety concerns remain – Update 7". World Health Organization. Retrieved 14 February 2020.
  3. ^ "Summary of probable SARS cases with onset of illness from 1 November 2002 to 31 July 2003". World Health Organization. 21 April 2004.
  4. ^ "衛生署針對報載SARS死亡人數有極大差異乙事提出說明" [DH's statement on significant differences in reported SARS deaths] (in Chinese). 台灣衛生福利部疾病管制署 (Disease Control Agency, Taiwan Ministry of Health and Welfare).
  5. ^ "十年前SARS流行 346人感染73死亡" [Ten years ago SARS epidemic 346 people infected 73 died] (in Chinese). 公視 (Public viewing).
  6. ^ Severe Acute Respiratory Syndrome (SARS) – multi-country outbreak – Update 6. World Health Organization {, accessed 22 January 2020
  7. ^ Cyranoski, D. (2003). "China joins investigation of mystery pneumonia". Nature. 422 (6931): 459. Bibcode:2003Natur.422..459C. doi:10.1038/422459b. PMID 12673214.
  8. ^ Rosenthal, E.; Altman, L. K. (27 March 2003). "China Raises Tally of Cases and Deaths in Mystery Illness". The New York Times. Archived from the original on 6 May 2009. Retrieved 11 March 2009.
  9. ^ "IDEESE Case: SARS". Retrieved 20 April 2015.
  10. ^ Peter McGrath (12 February 2013). "Scientists wait for next mass killer to spill over from nature" (Zhou is erroneously named Zhou Zoufeng in the article). The Yorkshire Post. Retrieved 26 January 2020.
  11. ^ Abraham, Thomas (2004). Twenty-first Century Plague: The Story of SARS. Retrieved 22 January 2020.
  12. ^ a b c Khan, Ali S. & Patrick, William. (2016). “The Next Pandemic.” New York: PublicAffairs.
  13. ^ Low, Donald (2004). Learning from SARS: Preparing for the Next Disease Outbreak: Workshop Summary. National Academies Press (US). pp. 63–71.
  14. ^ Yeoh, En-Lai (9 April 2003). "Singapore Woman Linked to 100 SARS Cases". Associated Press.
  15. ^ "Update: Outbreak of Severe Acute Respiratory Syndrome --- Worldwide, 2003". Retrieved 20 April 2015.
  16. ^ Koh, D.; Lim, M. K. (1 August 2003). "SARS and occupational health in the air". Occupational and Environmental Medicine. 60 (8): 539–540. doi:10.1136/oem.60.8.539. ISSN 1351-0711. PMC 1740596. PMID 12883012.
  17. ^ "Closure of schools: Joint Press Release by MOE and MOH". NAS. 26 March 2003. Retrieved 15 January 2020.
  18. ^ Severe Acute Respiratory Syndrome - Press briefing 1 April 2003, accessed 22 January 2020
  19. ^ "Phased Reopening of Schools". NAS. 5 April 2003. Retrieved 15 January 2020.
  20. ^ Keith Bradsher With Lawrence K. Altman: Asian Officials Say Mysterious Disease May Be Here to Stay 9 April 2003, accessed 22 January 2020
  21. ^ "Church Member Dies of SARS", 11 April 2003,, accessed 22 January 2020
  22. ^ "Panic as China's SARS toll rises". 12 April 2003. Retrieved 20 April 2015.
  23. ^ Reported on CBS's The Early Show Tatiana Morales: American Family Affected By SARS 11 April 2003,, accessed 22 January 2020
  24. ^ "American SARS boy back home [SOUTHCN.COM]". Retrieved 20 April 2015.
  25. ^ " - Timeline: SARS outbreak - Apr. 24, 2003". Retrieved 20 April 2015.
  26. ^ Sars illness 'not under control' 11 April 2003,, accessed 22 January 2020
  27. ^ Scientists claim SARS breakthrough 14 April 2003, Archived from, accessed 22 January 2020
  28. ^ Coronavirus never before seen in humans is the cause of SARS Unprecedented collaboration identifies new pathogen in record time Geneva, 16 April 2003,, accessed 22 January 2020
  29. ^ [1] SARS in India
  30. ^ [2] Sars spreads to India
  31. ^ 10 tips to prevent coronavirus 10 February 2020, accessed 26 January 2020
  32. ^ Chang Yun-ping (25 April 2003). "SARS epidemic: Taipei City closes down hospital". Taipei Times. Retrieved 22 January 2020.
  33. ^ Toronto travel warning lifted 30 April 2003,, accessed 22 January 2020
  34. ^ Cohen, Tom (29 May 2003). "Canada Broadens Definition of SARS Cases". Kansas City Star. Associated Press. Archived from the original on 30 October 2004.
  35. ^ Zhang, Feng (2 July 2004). "Officials punished for SARS virus leak". China Daily.
  36. ^ Stephenson, Joan (2 June 2004). "SARS in China". JAMA. 291 (21): 2534. doi:10.1001/jama.291.21.2534-d.
  37. ^ Liang, WN; et al. (2006). "Severe acute respiratory syndrome--retrospect and lessons of 2004 outbreak in China". Biomed Environ Sci. 19 (6): 445–51. PMID 17319269.
  38. ^ Zhang, Feng. "Officials punished for SARS virus leak". China Daily. Retrieved 14 February 2020.
  39. ^ Jim Yardley: After Its Epidemic Arrival, SARS Vanishes 15 May 2005 New York Times, accessed 22 January 2020


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