Content on this page was developed during the 2009-2010 H1N1 pandemic and has not been updated.
- The H1N1 virus that caused that pandemic is now a regular human flu virus and continues to circulate seasonally worldwide.
- The English language content on this website is being archived for historic and reference purposes only.
- For current, updated information on seasonal flu, including information about H1N1, see the CDC Seasonal Flu website.
Morbidity & Mortality Weekly Reports (MMWR)
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Deaths and Hospitalizations Related to 2009 Pandemic Influenza A (H1N1) --- Greece, May 2009--February 2010
 Morbidity and Mortality Weekly Report (MMWR) June 11, 2010 / 59(22);682-686
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Preliminary Results: Surveillance for Guillain-Barré Syndrome After Receipt of Influenza A (H1N1) 2009 Monovalent Vaccine — United States, 2009–2010
 Morbidity and Mortality Weekly Report (MMWR) June 2, 2010 / 59(Early Release);1-5
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Influenza Activity --- United States, August 30, 2009 - March 27, 2010, and Composition of the 2010 - 11 Influenza Vaccine
 Morbidity and Mortality Weekly Report (MMWR) April 16, 2010 / 59(14);423-430
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Interim Results: Influenza A  (H1N1) 2009 Monovalent and Seasonal Influenza Vaccination Coverage Among Health-Care  Personnel --- United States, August 2009--January 2010
 Morbidity and Mortality Weekly Report (MMWR) April 2, 2010 / 59(12);357-362
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                      Interim Results: State-Specific  Influenza A (H1N1) 2009 Monovalent Vaccination Coverage--- United States, October 2009--January 2010
 Morbidity and Mortality Weekly Report (MMWR) April 2, 2010 / 59(12); 363-368
- 2009 Pandemic Influenza A (H1N1) in Pregnant Women Requiring Intensive Care --- New York City, 2009
 Morbidity and Mortality Weekly Report (MMWR) March 26, 2010 / 59(11);321-326
- Outbreak of 2009 Pandemic Influenza A (H1N1) on a Peruvian Navy Ship --- June--July 2009
 Morbidity and Mortality Weekly Report (MMWR) February 19, 2010 / 59(06);162-165
 
- Outbreaks of 2009 Pandemic Influenza A (H1N1) Among Long-Term--Care Facility Residents --- Three States, 2009
 Morbidity and Mortality Weekly Report (MMWR) January 29, 2010 / 59(03);74-77
 
- Update: Influenza Activity --- United States, August 30, 2009--January 9, 2010
 Morbidity and Mortality Weekly Report (MMWR) January 22, 2010 / Vol. 59, No. 2
 
- Interim Results: Influenza A (H1N1) 2009 Monovalent Vaccination Coverage - United States, October - December 2009
 Morbidity and Mortality Weekly Report (MMWR) January 22, 2010 / Vol. 59(02);44-48
 
- Interim Results: Influenza A (H1N1) 2009 Monovalent Vaccination Coverage - United States, October - December 2009
 Morbidity and Mortality Weekly Report (MMWR) January 15, 2010 / Vol. 59 / Early Release
 
- Patients Hospitalized with 2009 Pandemic Influenza A (H1N1) --- New York City, May 2009
 Morbidity and Mortality Weekly Report (MMWR) January 8, 2010 / 58(51 & 52);1436-1440
 
- Outbreak of 2009 Pandemic Influenza A (H1N1) at a School --- Hawaii, May 2009
 Morbidity and Mortality Weekly Report (MMWR) January 8, 2010 / 58(51 & 52);1440-1444
 
- Intent to Receive Influenza A (H1N1 2009 Monovalent and Seasonal Influenza Vaccines --- Two Counties, North   Carolina, August 2009
 Morbidity and Mortality Weekly Report (MMWR) December 25, 2009 / 58(50);1401-1405
- Deaths Related to 2009 Pandemic Influenza A (H1N1) Among American Indian/Alaska Natives --- 12 States, 2009
 Morbidity and Mortality Weekly Report (MMWR) December 11, 2009 / Vol. 58 / No. 48 / p1341-1344
- Safety of Influenza A (H1N1) 2009 Monovalent Vaccines --- United States, October 1--November 24, 2009
 Morbidity and Mortality Weekly Report (MMWR) December 4, 2009 / Vol. 58 (Early Release) / p1-6
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Effectiveness of 2008--09 Trivalent Influenza Vaccine Against 2009 Pandemic Influenza A (H1N1) --- United States, May--June 2009
 Morbidity and Mortality Weekly Report (MMWR) November 13, 2009 / Vol. 58 / No. 44 / p1241-1245
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                        Update: Influenza Activity --- United States, August 30--October 31, 2009
 Morbidity and Mortality Weekly Report (MMWR) November 13, 2009 / Vol. 58 / No. 44 / p1236 -1241
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                        Introduction and Transmission of 2009 Pandemic Influenza A (H1N1) Virus --- Kenya, June--July 2009
 Morbidity and Mortality Weekly Report (MMWR) October 23, 2009 / Vol. 58 / No. 41 / p1143-1146
- Update on Influenza A (H1N1) 2009 Monovalent Vaccines
 Morbidity and Mortality Weekly Report (MMWR) October 9, 2009 / Vol. 58 / No. 39 / p1100-1101
- Bacterial Coinfections in Lung Tissue Specimens from Fatal Cases of 2009 Pandemic Influenza A (H1N1) --- United States, May--August 2009
 Morbidity and Mortality Weekly Report (MMWR) October 2, 2009 / Vol. 58 / No. 38 / p1071-10
- Performance of Rapid Influenza Diagnostic Tests During Two School Outbreaks of 2009 Pandemic Influenza A (H1N1) Virus Infection --- Connecticut, 2009
 Morbidity and Mortality Weekly Report (MMWR) September 25, 2009 / 58(37);1029-1032
- Update: Influenza   Activity --- United States, April--August 2009
 Morbidity and Mortality Weekly Report (MMWR) Sept. 18, 2009 / Vol. 58 / No. 36 / p1009-1012
- Oseltamivir-Resistant   2009 Pandemic Influenza A (H1N1) Virus Infection in Two Summer   Campers Receiving Prophylaxis-North Carolina, 2009
 Morbidity and Mortality Weekly Report (MMWR) Sept. 11, 2009 / Vol. 58 / No. 35 / p969-972
- Surveillance for Pediatric Deaths Associated with 2009   Pandemic Influenza A (H1N1) Virus Infection --- United States, April--August   2009
 Morbidity and Mortality Weekly Report (MMWR) Sept. 4, 2009 / Vol. 58 / No. 34 / p941-947
- 2009 Pandemic Influenza A (H1N1) Virus Infections ---   Chicago, Illinois, April--July 2009
 Morbidity and Mortality Weekly Report (MMWR) Aug. 28, 2009 / Vol. 58 / No. 33 / p913-918
- Surveillance for the 2009 Pandemic Influenza A (H1N1)   Virus and Seasonal Influenza Viruses --- New Zealand, 2009
 Morbidity and Mortality Weekly Report (MMWR) Aug. 28, 2009 / Vol. 58 / No. 34 / p918-921
- Oseltamivir-Resistant Novel Influenza A (H1N1) Virus   Infection in Two Immunosuppressed Patients --- Seattle, Washington,   2009
 Morbidity and Mortality Weekly Report (MMWR) Aug. 21, 2009 / Vol. 58 / No. 32 / p893-896
- Evaluation of Rapid Influenza Diagnostic Tests for   Detection of Novel Influenza A (H1N1) Virus --- United States,   2009
 Morbidity and Mortality Weekly Report (MMWR) Aug. 7, 2009 / Vol. 58 / No. 30 / p826-829
- Intensive-Care Patients With Severe Novel Influenza A   (H1N1) Virus Infection --- Michigan, June 2009
 Morbidity and Mortality Weekly Report (MMWR) July 17, 2009 / Vol. 58 / No. 27 / p749-752
- Novel Influenza A (H1N1) Virus Infections Among   Health-Care Personnel --- United States, April--May 2009
 Morbidity and Mortality Weekly Report (MMWR) June 19, 2009 / Vol. 58 / No. 23 / p641-645
- Update: Novel Influenza A (H1N1) Virus Infection --- Mexico, March—May, 2009
 Morbidity and Mortality Weekly Report (MMWR) June 5, 2009 / Vol. 58 / No. 21 / p585-589
- Hospitalized Patients with Novel Influenza A (H1N1) Virus Infection --- California, April—May, 2009
 Morbidity and Mortality Weekly Report (MMWR) May 22, 2009 / Vol. 58 / No. 19 / p536-541
- Serum Cross-Reactive Antibody Response to a Novel Influenza A (H1N1) Virus After Vaccination with Seasonal Influenza Vaccine
 Morbidity and Mortality Weekly Report (MMWR) May 22, 2009 / Vol. 58 / No. 19 / p521-524
- Novel Influenza A (H1N1) Virus Infections in Three Pregnant Women --- United States, April--May 2009
 Morbidity and Mortality Weekly Report (MMWR) May 15, 2009 / 58(18);497-500
- Update: Novel Influenza A (H1N1) Virus Infections — Worldwide, May 6, 2009 
 Morbidity and Mortality Weekly Report (MMWR) May 8, 2009 / Vol. 58 / No. 17 / p453–458
- Outbreak of Swine-Origin Influenza A (H1N1) Virus Infection --- Mexico, March--April 2009
 Morbidity and Mortality Weekly Report (MMWR) May 8, 2009 / 58(17);467-470
- Swine-Origin Influenza A (H1N1) Virus Infections in a School --- New York City, April 2009
 Morbidity and Mortality Weekly Report (MMWR) May 8, 2009 / 58(17);470-472
- Update: Swine-Origin Influenza A (H1N1) Virus --- United States and Other Countries
 Morbidity and Mortality Weekly Report (MMWR) May 1, 2009 / 58(16);421
- Update: Infections With a Swine-Origin Influenza A (H1N1)   Virus — United States and Other Countries, April 28, 2009 
 Morbidity and Mortality Weekly Report (MMWR) May 1, 2009 / Vol. 58 / No. 16 / p431–433
- Swine Influenza A (H1N1) Infection in Two Children — Southern California, March—April 2009
 Morbidity and Mortality Weekly Report (MMWR) May 1, 2009 / Vol. 58 / No. 15 / p400–402
- Update: Swine Influenza A (H1N1) Infections --- California and Texas, April 2009
 Morbidity and Mortality Weekly Report (MMWR) May 1, 2009 / 58(16);435-437
- Outbreak of Swine-Origin Influenza A (H1N1) Virus Infection — Mexico, March—April 2009
 Morbidity and Mortality Weekly Report (MMWR) April 30, 2009 / Vol. 58 / Dispatch ;1–3
- Swine-Origin Influenza A (H1N1) Virus Infections in a School—New York City, April 2009
 Morbidity and Mortality Weekly Report (MMWR) April 30, 2009 / Vol. 58 / Dispatch ;1–3
- Update: Swine Influenza A (H1N1) Infections—California and Texas, April 2009
 Morbidity and Mortality Weekly Report (MMWR) April 24, 2009 / Vol. 58 / Dispatch;1–3
- Swine Influenza A (H1N1) Infection in Two Children—Southern California, March–April 2009
 Morbidity and Mortality Weekly Report (MMWR) April 21, 2009 / Vol. 58 / Dispatch
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