See also: 2009 flu pandemic timeline, 2009 flu pandemic by country, 2009 flu pandemic table and 2009 flu pandemic summary.
See main article: 2009 flu pandemic.
This article covers the chronology of the 2009 novel influenza A (H1N1) pandemic. Flag icons denote the first announcements of confirmed cases by the respective nation-states, their first deaths (and other major events such as their first intergenerational cases, cases of zoonosis, and the start of national vaccination campaigns), and relevant sessions and announcements of the World Health Organization (WHO), the European Union (and its agency the European Centre for Disease Prevention and Control),and the U.S. Centers for Disease Control (CDC).
Unless otherwise noted, references to terms like S-OIV, H1N1 and such, all refer to this new A(H1N1) strain and not to sundry other strains of H1N1 which are endemic in humans, birds and pigs.
| 2009 | A(H1N1) Outbreak and Pandemic Milestones | |
|---|---|---|
| 17 March |  First case in the world of what was later identified as swine flu origin. | |
| 28 March |  First country's case affected the disease in the US of what was later identified as swine flu origin. | |
| 12 April | First known death due to what was later identified as swine flu origin. | |
| 24 April | First Diseases Outbreak Notice mention of the Swine Flu by the World Health Organization. | |
| 25 April | The United States is the first country to have Community outbreaks confirmed. | |
| Community outbreaks confirmed in Mexico. | ||
| 27 April |  First case confirmed in Canada. | |
 First case confirmed in Spain. | ||
 First case confirmed in the United Kingdom. | ||
| 28 April |  First case confirmed in Israel. | |
 First case confirmed in New Zealand. | ||
| 29 April | First death confirmed in the United States. | |
 First case confirmed in Germany. | ||
 First case confirmed in Austria. | ||
| 30 April |  First case confirmed in the Netherlands. | |
 First case confirmed in Switzerland. | ||
 First case confirmed in Ireland. | ||
| 1 May |  First case confirmed in Hong Kong, China. | |
 First case confirmed in Denmark. | ||
 First case confirmed in France. | ||
| 2 May |  First case confirmed in Italy. | |
| First case confirmed in South Korea. | ||
 First case confirmed in Costa Rica. | ||
| 3 May |  First case confirmed in Colombia. | |
 First case confirmed in Portugal. | ||
| First human-to-animal transmission of the virus in Canada | ||
| 4 May |  First case confirmed in El Salvador. | |
| 5 May |  First case confirmed in Guatemala. | |
| 6 May |  First case confirmed in Poland. | |
 First case confirmed in Sweden. | ||
| 7 May |  First case confirmed in Argentina. | |
 First case confirmed in Brazil. | ||
| First death confirmed in Canada. | ||
| First case of zoonosis in Canada, where an infected pig infects a human | ||
| 8 May |  First case confirmed in Japan. | |
 First case confirmed in Panama. | ||
| Community outbreaks confirmed in Canada. | ||
| 9 May |  First case confirmed in Australia. | |
 First case confirmed in Norway. | ||
| First death confirmed in Costa Rica. | ||
| 10 May |  First case confirmed in China. | |
| 12 May |  First case confirmed in Thailand. | |
 First case confirmed in Cuba. | ||
 First case confirmed in Finland. | ||
| 13 May |  First case confirmed in Belgium. | |
| Community outbreaks confirmed in Costa Rica. | ||
| 14 May |  First case confirmed in Peru. | |
| 15 May |  First case confirmed in Malaysia. | |
 First case confirmed in Ecuador. | ||
| 16 May |  First case confirmed in India. | |
 First case confirmed in Turkey. | ||
| 17 May |  First case confirmed in Chile. | |
| Community outbreaks confirmed in Japan. | ||
| 18 May |  First case confirmed in Greece. | |
| 19 May |  First case confirmed in Paraguay. | |
| First case confirmed in Taiwan. | ||
| 21 May |  First case confirmed in the Philippines. | |
| 22 May |  First case confirmed in Honduras. | |
| First case confirmed in Russia. | ||
| 23 May |  First case confirmed in Iceland. | |
| 24 May |  First case confirmed in Kuwait. | |
 First case confirmed in United Arab Emirates. | ||
| 25 May |  First case confirmed in Bahrain. | |
 First case confirmed in Czech Republic. | ||
| 26 May |  First case confirmed in Puerto Rico. | |
| Community outbreaks confirmed in United Kingdom. | ||
| 27 May |  First case confirmed in Romania. | |
 First case confirmed in Singapore. | ||
 First case confirmed in Dominican Republic. | ||
 First case confirmed in Uruguay. | ||
| 28 May | First case confirmed in Bolivia. | |
| First case confirmed in Venezuela. | ||
 First case confirmed in Slovakia. | ||
| Community outbreaks confirmed in Argentina. | ||
| Community outbreaks confirmed in Australia. | ||
| 29 May |  First case confirmed in Hungary. | |
| 30 May |  First case confirmed in Cyprus. | |
 First case confirmed in Estonia. | ||
 First case confirmed in Lebanon. | ||
| Community outbreaks confirmed in Chile. | ||
| 31 May | First case confirmed in Vietnam. | |
 First case confirmed in Bahamas. | ||
| Community outbreaks confirmed in Germany. | ||
| 1 June |  First case confirmed in Bulgaria. | |
| 2 June | First death confirmed in Chile. | |
 First case confirmed in Luxembourg. | ||
 First case confirmed in Ukraine. | ||
 First case confirmed in Nicaragua. | ||
 First case confirmed in Egypt. | ||
 First case confirmed in Bermuda. | ||
| 3 June |  First case confirmed in Saudi Arabia. | |
 First case confirmed in Barbados. | ||
 First case confirmed in Jamaica. | ||
| 4 June |  First case confirmed in Trinidad and Tobago. | |
| 5 June | First death confirmed in Dominican Republic. | |
 First case confirmed in Cayman Islands. | ||
| Community outbreaks confirmed in Switzerland. | ||
| 7 June |  First case confirmed in Martinique. | |
| 8 June |  First case confirmed in Dominica. | |
| 9 June | First death confirmed in Colombia. | |
| 10 June | First death confirmed in Guatemala. | |
 First case confirmed in French Polynesia. | ||
| Community outbreaks confirmed in Guatemala. | ||
| 11 June | The WHO raises its Pandemic Alert Level to Phase 6. | |
| First case confirmed in the Palestinian Territories. | ||
| First case confirmed in British Virgin Islands. | ||
| Community outbreaks confirmed in Hong Kong. | ||
| 12 June |  First case confirmed in Morocco. | |
| First case confirmed in Isle of Man. | ||
| Community outbreaks confirmed in Uruguay. | ||
| 14 June | First death confirmed in the United Kingdom. | |
| Community outbreaks confirmed in Philippines. | ||
| 15 June | First death confirmed in Argentina. | |
| 16 June |  First case confirmed in Jordan. | |
 First case confirmed in Qatar. | ||
 First case confirmed in Samoa. | ||
 First case confirmed in Sri Lanka. | ||
 First case confirmed in Suriname. | ||
 First case confirmed in Yemen. | ||
| Community outbreaks confirmed in Thailand. | ||
| 17 June |  First case confirmed in Monaco. | |
| First case confirmed in U.S. Virgin Islands. | ||
| First case confirmed in Netherlands Antilles. | ||
 First case confirmed in Oman. | ||
| Community outbreaks confirmed in Malaysia. | ||
| Community outbreaks confirmed in France. | ||
| 18 June | First case confirmed in Laos. | |
 First case confirmed in Macao. | ||
 First case confirmed in South Africa. H1N1 now present in all WHO regions. | ||
 First case confirmed in Papua New Guinea. | ||
| First case confirmed in the island of Jersey. | ||
| 19 June | First death confirmed in Australia. | |
 First case confirmed in Antigua and Barbuda. | ||
 First case confirmed in Bangladesh. | ||
 First case confirmed in Ethiopia. | ||
 First case confirmed in Slovenia. | ||
| 20 June |  First case confirmed in Algeria. | |
| Community outbreaks confirmed in Venezuela. | ||
| 21 June |  First case confirmed in Fiji. | |
| First case confirmed in Brunei. | ||
| 22 June | First death confirmed in the Philippines. | |
| First case confirmed in Iran. | ||
 First case confirmed in Montenegro. | ||
 First case confirmed in Tunisia. | ||
| First death confirmed in Honduras. | ||
| 23 June |  First case confirmed in Latvia. | |
| Community outbreaks confirmed in Macao. | ||
| 24 June |  First case confirmed in Indonesia. | |
 First case confirmed in Cape Verde Islands. | ||
 First case confirmed in Côte d'Ivoire. | ||
 First case confirmed in Cambodia. | ||
 First case confirmed in Iraq. | ||
 First case confirmed in Serbia. | ||
 First case confirmed in Vanuatu. | ||
| 25 June | First human-to-animal transmission of the virus in Argentina. | |
| 26 June |  First case confirmed in Lithuania. | |
| First case confirmed in Guernsey. | ||
| Community outbreaks confirmed in China. | ||
| 27 June |  First case confirmed in Myanmar. | |
 First case confirmed in New Caledonia. | ||
| First death confirmed in Thailand. | ||
| 28 June | First death confirmed in Brazil. | |
| 29 June | First death confirmed in Spain. | |
| First death confirmed in Uruguay. | ||
| First case of Oseltamivir (Tamiflu) resistance from Denmark found in the world. | ||
 First case confirmed in Bosnia and Herzegovina. | ||
 First case confirmed in Kenya. | ||
 First case confirmed in Mauritius. | ||
 First case confirmed in Nepal. | ||
| Community outbreaks confirmed in Italy. | ||
| Community outbreaks confirmed in Singapore. | ||
| 30 June |  First case confirmed in Saint Lucia. | |
| Community outbreaks confirmed in Egypt. | ||
| First case of Oseltamivir (Tamiflu) resistance found in Chile. | ||
| 1 July |  First case confirmed in Guam. | |
 First case confirmed in Malta. | ||
| Community outbreaks confirmed in South Korea. | ||
| 2 July | First death confirmed in Brunei. | |
| First death confirmed in Paraguay. | ||
| First case of Oseltamivir (Tamiflu) resistance found in Japan. | ||
 First case confirmed in Uganda. | ||
 First case confirmed in Saint Vincent and the Grenadines. | ||
| 3 July | First case of Oseltamivir (Tamiflu) resistance found in Hong Kong, China. | |
 First case confirmed in Aruba. | ||
| First death confirmed in El Salvador. | ||
| 4 July | First death confirmed in New Zealand. | |
 First case confirmed in Croatia. | ||
| First case confirmed in Macedonia. | ||
| First case confirmed in Syria. | ||
| Community outbreaks confirmed in Spain. | ||
| 5 July | First death confirmed in Peru. | |
 First case confirmed in Palau | ||
| 6 July | First case confirmed in Guadeloupe. | |
 First case confirmed in Libya. | ||
| First case confirmed in Saint Martin. | ||
| First death confirmed in Jamaica. | ||
| 7 July |  First case confirmed in Guyana. | |
 First case confirmed in Belize. | ||
 First case confirmed in Cook Islands. | ||
| Community outbreaks confirmed in Portugal. | ||
| 8 July |  First case confirmed in Afghanistan. | |
 First case confirmed in Seychelles. | ||
| Community outbreaks confirmed in Malta. | ||
| 9 July | First case confirmed in Tanzania. | |
| Community outbreaks confirmed in Panama. | ||
| 10 July |  First case confirmed in Botswana. | |
| First case confirmed in Réunion. | ||
 First case confirmed in Zimbabwe. | ||
| First death confirmed in Bolivia. | ||
| First death confirmed in Ecuador. | ||
| First death confirmed in Hong Kong. | ||
| 11 July |  First case confirmed in Andorra. | |
| Community outbreaks confirmed in New Zealand. | ||
| 13 July | Community outbreaks confirmed in Saudi Arabia. | |
| 14 July |  First case confirmed in Haiti. | |
 First case confirmed in Marshall Islands. | ||
 First case confirmed in Saint Kitts and Nevis. | ||
| First death confirmed in Puerto Rico. | ||
| 15 July |  First case confirmed in Tonga. | |
| 16 July |  First case confirmed in Sudan. | |
| First death confirmed in Singapore. | ||
| Community outbreaks confirmed in Brazil. | ||
| Community outbreaks confirmed in Morocco. | ||
| Community outbreaks confirmed in Colombia. | ||
| 18 July | First death confirmed in Venezuela. | |
| 19 July |  First case confirmed in Georgia. | |
| First death confirmed in Egypt. | ||
| First death confirmed in Panama. | ||
| Community outbreaks confirmed in Israel. | ||
| 20 July | First death confirmed in Guam. | |
 First case confirmed in Albania. | ||
 First case confirmed in Namibia. | ||
| Community outbreaks confirmed in Norway. | ||
| 21 July | First case confirmed in Federated States of Micronesia. | |
 First case confirmed in Northern Mariana Islands. | ||
| First case of Oseltamivir (Tamiflu) resistance found in Canada. | ||
| Community outbreaks confirmed in Indonesia. | ||
| 22 July | First death confirmed in Hungary. | |
| First death confirmed in Laos. | ||
| First death confirmed in Tonga. | ||
| Community outbreaks confirmed in India. | ||
| Community outbreaks confirmed in Ireland. | ||
| Community outbreaks confirmed in Peru. | ||
| Community outbreaks confirmed in Vietnam. | ||
| Community outbreaks confirmed in Jamaica. | ||
| 23 July | First death confirmed in Malaysia. | |
 First case confirmed in American Samoa. | ||
 First case confirmed in Bhutan. | ||
 First case confirmed in Kazakhstan. | ||
 First case confirmed in Turks and Caicos Islands. | ||
| Community outbreaks confirmed in Bolivia. | ||
| Community outbreaks confirmed in Sweden. | ||
| 24 July | Community outbreaks confirmed in Fiji. | |
| First case confirmed in Falklands Islands. | ||
 First case confirmed in Gibraltar. | ||
 First case confirmed in Grenada. | ||
 First case confirmed in Maldives. | ||
| 25 July | Community outbreaks confirmed in Brunei. | |
| Community outbreaks confirmed in Ecuador. | ||
| Community outbreaks confirmed in El Salvador. | ||
| Community outbreaks confirmed in Greece. | ||
| Community outbreaks confirmed in Nicaragua. | ||
| Community outbreaks confirmed in South Africa. | ||
| Community outbreaks confirmed in Taiwan. | ||
| First death confirmed in Indonesia. | ||
| 26 July | Community outbreaks confirmed in Cuba. | |
| Community outbreaks confirmed in Cyprus. | ||
| Community outbreaks confirmed in Honduras. | ||
| Community outbreaks confirmed in Paraguay. | ||
| Community outbreaks confirmed in Turkey. | ||
| 27 July | Community outbreaks confirmed in Denmark. | |
| Community outbreaks confirmed in Netherlands. | ||
| Community outbreaks confirmed in United Arab Emirates. | ||
| First death confirmed in Israel. | ||
| First death confirmed in Saint Kitts and Nevis. | ||
| First death confirmed in Saudi Arabia. | ||
| First case confirmed in Kosovo. | ||
 First case confirmed in Zambia. | ||
| 28 July | First case of Oseltamivir (Tamiflu) resistance found in Argentina. | |
| 29 July |  First case confirmed in Swaziland. | |
| 30 July |  First case confirmed in Azerbaijan. | |
 First case confirmed in Gabon. | ||
| First case confirmed in Moldova. | ||
| First death confirmed in Belgium. | ||
| First death confirmed in France. | ||
| First death confirmed in Lebanon. | ||
| First death confirmed in Taiwan. | ||
| 31 July | First case confirmed in French Guiana. | |
 First case confirmed in Nauru. | ||
| First death confirmed in Qatar. | ||
| First case of zoonosis in Brazil, where an infected pig infects a human. | ||
| 2 August | First death confirmed in India. | |
| 3 August | First death confirmed in South Africa. | |
| First case confirmed in Akrotiri and Dhekelia. | ||
 First case confirmed in Pakistan. | ||
| 4 August |  First case confirmed in Solomon Islands. | |
| First death confirmed in Vietnam. | ||
| First death confirmed in Netherlands. | ||
| 5 August | First death confirmed in Iran. | |
 First case confirmed in Anguilla. | ||
| 6 August |  First case confirmed in Ghana. | |
 First case confirmed in Kiribati. | ||
 First case confirmed in Liechtenstein. | ||
| 7 August | First death confirmed in Ireland. | |
| First death confirmed in Palestine. | ||
| First death confirmed in Samoa. | ||
| 8 August | First case of Oseltamivir (Tamiflu) resistance found in Thailand. | |
| 9 August | Community outbreaks confirmed in Algeria. | |
| First death confirmed in Iraq. | ||
| 10 August | First death confirmed in Mauritius. | |
| 12 August | First case confirmed in East Timor. | |
 First case confirmed in Wallis and Futuna. | ||
| First death confirmed in Nicaragua. | ||
| First case of Oseltamivir (Tamiflu) resistance found in Brazil. | ||
| 14 August |  First case confirmed in Cameroon. | |
 First case confirmed in Madagascar. | ||
| First case of Oseltamivir (Tamiflu) resistance found in China. | ||
| First case of Oseltamivir (Tamiflu) resistance found in Singapore. | ||
| First case of Oseltamivir (Tamiflu) resistance found in United States. | ||
| 15 August | First case of Oseltamivir (Tamiflu) resistance found in Peru. | |
| First death confirmed in Japan. | ||
| First death confirmed in South Korea. | ||
| First case confirmed in the Democratic Republic of the Congo. | ||
| 17 August |  First case confirmed in Mozambique. | |
| 18 August | First death confirmed in Malta. | |
| First death confirmed in Cook Islands. | ||
| First death confirmed in Yemen. | ||
| 19 August |  First case confirmed in Belarus. | |
| 20 August | First death confirmed in Kuwait. | |
| First death confirmed in United Arab Emirates. | ||
| 21 August | First cases in birds in the world confirmed in Chile. | |
| First death confirmed in Oman. | ||
| 22 August | First death confirmed in New Caledonia. | |
| 23 August | First death confirmed in Greece. | |
| 24 August | First death confirmed in French Polynesia. | |
 First case confirmed in Kyrgyzstan. | ||
| 26 August | ||
| First death confirmed in Syria. | ||
| First human-to-animal transmission of the virus in Brazil. | ||
 First case confirmed in Angola. | ||
| 28 August | First cases in birds confirmed in Brazil. | |
| 29 August | First death confirmed in Bangladesh. | |
| 30 August | First head of state to have swine flu confirmed in Colombia | |
| 31 August |  First case confirmed in Djibouti. | |
| First death confirmed in Sweden. | ||
| First death confirmed in Bahrain. | ||
| 1 September |  First case confirmed in Lesotho. | |
 First death confirmed in Reunion. | ||
| 2 September | First death confirmed in Macau. | |
| 3 September | First death confirmed in Norway. | |
| First death confirmed in Marshall Islands. | ||
| First death confirmed in U.S. Virgin Islands. | ||
| 4 September | First death confirmed in Italy. | |
| 7 September | First death confirmed in Namibia. | |
| Ecuador's Chief of Presidential Security John Merino dies. | ||
 First case confirmed in Faroe Islands. | ||
| 8 September | First death confirmed in Suriname. | |
| 9 September | First death confirmed in Madagascar. | |
| 10 September |  First case confirmed in Malawi. | |
| First case of Oseltamivir (Tamiflu) resistance found in Israel. | ||
| First Oseltamivir (Tamiflu) resistance spread from person to person found in the United States in the world. | ||
| 11 September | First case of Oseltamivir (Tamiflu) resistance found in Australia. | |
| 14 September | First death confirmed in Mozambique. | |
| 15 September | First death confirmed in Solomon Islands. | |
| 17 September | First death confirmed in Luxembourg. | |
| 18 September | First death confirmed in Martinique. | |
| 21 September | Mass vaccinations, which are the first ones in the world, begin in China. | |
| 23 September | First death confirmed in Portugal. | |
| First death confirmed in Bahamas. | ||
| 25 September | First death confirmed in Germany. | |
| 28 September | First death confirmed in Cambodia. | |
| 29 September | First human-to-animal transmission of the virus in Ireland. | |
| 30 September | First death confirmed in Bulgaria. | |
| First death confirmed in Barbados. | ||
| First completed clinical trials by a company for 2009/H1N1 vaccine in the world. | ||
| Mass vaccinations begin in Australia. | ||
| 1 October | First case confirmed in Saint-Barthélemy. | |
| 4 October |  First case confirmed in Tajikistan. | |
| 6 October | First death confirmed in China. | |
| First death confirmed in Tanzania. | ||
| 10 October | First death confirmed in Cuba. | |
| 12 October | First case of Oseltamivir (Tamiflu) resistance found in Vietnam. | |
| First death confirmed in Jordan. | ||
 First case confirmed in Rwanda. | ||
| First case confirmed in São Tomé and Príncipe. | ||
| Mass vaccinations begin in Sweden. | ||
| First human-to-animal transmission of the virus in Norway. | ||
| 13 October |  First case confirmed in Mongolia. | |
| 15 October | First death confirmed in Trinidad and Tobago. | |
| 18 October | First death confirmed in Sudan. | |
| 19 October | Mass vaccinations begin in Japan. | |
| 20 October | First death confirmed in Iceland. | |
| First cases in ferrets confirmed in the United States in the world. | ||
| 21 October | First cases in birds confirmed in Canada. | |
| First death confirmed in Serbia. | ||
| Mass vaccinations begin in the United Kingdom. | ||
| First human-to-animal transmission of the virus in Japan. | ||
| 22 October | First death confirmed in Czech Republic. | |
 First death confirmed in Guadeloupe. | ||
| 23 October | First death confirmed in Mongolia. | |
| 24 October | First death confirmed in Finland. | |
| 25 October | First death confirmed in São Tomé and Príncipe. | |
| First death confirmed in Turkey. | ||
| 26 October | First death confirmed in Moldova. | |
| Mass vaccinations begin in Oman. | ||
| 27 October | Mass vaccinations begin in Canada. | |
| Mass vaccinations begin in South Korea. | ||
| First death confirmed in Russia. | ||
| First human-to-animal transmission of the virus in the Iceland. | ||
| 29 October | First death confirmed in Afghanistan. | |
 First case confirmed in the Republic of the Congo. | ||
 First case confirmed in Nigeria. | ||
| 30 October | First death confirmed in Ukraine. | |
| 31 October | First death confirmed in Croatia. | |
| 1 November | Mass vaccinations begin in Ireland. | |
| Mass vaccinations begin in Kuwait. | ||
| Mass vaccinations begin in Morocco. | ||
| 2 November | First death confirmed in Austria. | |
| Mass vaccinations begin in Turkey. | ||
| 3 November | First death confirmed in Belarus. | |
| First death confirmed in Slovenia. | ||
| Mass vaccinations begin in Singapore. | ||
| Mass vaccinations begin in Egypt. | ||
| First cases in ferrets confirmed in Brazil. | ||
| 4 November | First feline zoonosis confirmed in the United States in the world. | |
| First case of Oseltamivir (Tamiflu) resistance found in Belarus. | ||
| First case of Oseltamivir (Tamiflu) resistance found in the Netherlands. | ||
| 5 November | First death confirmed in Saint Lucia. | |
 First case confirmed in San Marino. | ||
| 6 November | First death confirmed in Slovakia. | |
| First death confirmed in Pakistan. | ||
| First human-to-animal transmission of the virus in Hong Kong. | ||
| 7 November | First death confirmed in Sri Lanka. | |
| Mass vaccinations begin in Belgium. | ||
| Mass vaccinations begin in Bahrain. | ||
| Mass vaccinations begin in Saudi Arabia. | ||
| 8 November |  First case confirmed in Armenia. | |
| 9 November | First death confirmed in Latvia. | |
| 11 November |  First case confirmed in Burundi. | |
 First case confirmed in Greenland. | ||
| 12 November | Mass vaccinations begin in France. | |
| First feline zoonosis confirmed in Brazil. | ||
| 13 November | First death confirmed in Cyprus. | |
| First death confirmed in Poland. | ||
| 14 November | First death confirmed in Kosovo. | |
| First death confirmed in Switzerland. | ||
| 16 November | First case confirmed in North Korea. | |
 First case confirmed in Somalia. | ||
| First death confirmed in Tunisia. | ||
| First death confirmed in Morocco. | ||
| First death confirmed in Bosnia and Herzegovina. | ||
| Mass vaccinations begin in Greece. | ||
| Mass vaccinations begin in Spain. | ||
| Mass vaccinations begin in Cyprus. | ||
| 17 November | First death confirmed in Falkland Islands. | |
| First death confirmed in Maldives. | ||
| 18 November | First death confirmed in Lithuania. | |
| First death confirmed in Macedonia. | ||
| First case of Oseltamivir (Tamiflu) resistance found in Finland. | ||
| First case of Oseltamivir (Tamiflu) resistance found in Slovenia. | ||
| 19 November | First feline death confirmed in the United States in the world. | |
| 20 November | First case of Oseltamivir (Tamiflu) resistance found in the United Kingdom. | |
| First mutation (D222G) confirmed in Norway in the world. | ||
| First death confirmed in Denmark. | ||
| Mass vaccinations begin in Jordan. | ||
| 23 November | First death confirmed in Estonia. | |
| First death confirmed in Romania. | ||
| Mass vaccinations begin in Netherlands. | ||
| Mass vaccinations begin in Czech Republic. | ||
| 24 November | First double infection case confirmed in the United States in the world. | |
 First case confirmed in Montserrat. | ||
| 27 November | First death confirmed in Algeria. | |
| First double infection case confirmed in South Korea. | ||
| First mutation (D222G) confirmed in France. | ||
| First case of Oseltamivir (Tamiflu) resistance found in France. | ||
| 28 November | First canine zoonosis confirmed in China in the world. | |
| First human-to-animal transmission of the virus in Indonesia. | ||
| First mutation (D222G) confirmed in Brazil. | ||
| 30 November | First mutation (D222G) confirmed in Finland. | |
| First mutation (D222G) confirmed in Italy. | ||
| First human-to-animal transmission of the virus in Finland. | ||
| First double infection case confirmed in Brazil. | ||
| First death confirmed in Libya. | ||
| 1 December | First death confirmed in Montenegro. | |
| 2 December | First human-to-animal transmission of the virus in the United Kingdom. | |
| 3 December | First mutation (D222G) confirmed in Netherlands.[1] | |
| First death confirmed in Albania. | ||
| First canine zoonosis confirmed in Brazil. | ||
| 4 December | First mutation (D222G) confirmed in Spain. | |
| 7 December | First death confirmed in North Korea. | |
| 9 December | First mutation (D222G) confirmed in Macao. | |
| 13 December | First death confirmed in Georgia. | |
| Mass vaccinations begin in Qatar. | ||
| 14 December | First death confirmed in Armenia. | |
| 15 December | First human-to-animal transmission of the virus in France. | |
| 16 December | First case of Oseltamivir (Tamiflu) resistance found in Germany. | |
| 17 December | First human-to-animal transmission of the virus in Thailand. | |
| 20 December | First completed clinical trials by a company for 2009/H1N1 vaccine in Brazil. | |
| 21 December | First canine zoonosis confirmed in the United States. | |
| 27 December | First death confirmed in Nepal. | |
| 2010 | A(H1N1) Outbreak and Pandemic Milestones | |
| 1 January | Mass vaccinations begin in Malta. | |
| 5 January | Mass vaccinations begin in Brazil. | |
| 11 January |  First case confirmed in Mali. | |
| 15 January | Mass vaccinations begin in Peru. | |
| 19 January | First death confirmed in Nigeria. | |
| 20 January | First death confirmed in Bermuda. | |
| 29 January |  First case confirmed in Chad. | |
| 3 February |  First case confirmed in Mauritania. | |
| 9 February |  First case confirmed in Senegal. | |
| 25 February |  First case confirmed in Niger. | |
| 27 March | Mass vaccinations begin in Cuba. | |
| 2 April | Mass vaccinations begin in Cambodia. | |
| 12 April |  First case confirmed in Guinea. | |
| 26 April | Mass vaccinations begin in the Philippines. | |
| 10 August | H1N1 Pandemic officially declared over. |