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Basic InformationLatest NewsH1N1 Vaccination Still Highly RecommendedAs Swine Flu Fades, Experts Ponder Next SeasonClinical Trials Update: Jan. 28, 2010Number of People Infected by H1N1 Reaches 55 Million55 Million Americans Sickened by Swine Flu So FarShort School Closures Won't Shut Down FluAs Swine Flu Wanes, Don't Be FooledHealth Tip: Getting a Nasal Vaccine for FluH1N1 Transmissibility Similar to Other Flu VirusesSwine Flu Not As Infectious Among Young Adults As First FearedImmunocompromised Patients Need Aggressive Flu TreatmentFlu-Related School Closures Have Big Impact on FamiliesFlu Vaccine for Seniors ApprovedNew Weapon May Help Battle Bird FluSwine Flu May Be Rewriting the Flu-Season Script2009 H1N1 Took High Toll on Pregnant Women, ChildrenH1N1 Flu Waning, but Many Vaccine Doses UnusedNearly 5 Million Doses of Nasal Swine Flu Vaccine RecalledAs Swine Flu Wanes, So Does Public's FearClinical Trials Update: Dec. 22, 2009Single Shot of H1N1 Vaccine May Be Enough for KidsSwine Flu Wanes, But Future UncertainScientists Link Molecule to Severe Swine FluInformation Offered on Effect of H1N1 Vaccine SchedulesNon-Safety, Voluntary Recall of H1N1 Flu Vaccine IssuedAmerican Indians Have Far Higher H1N1 Flu Death RateLarge Recall of Children's Swine Flu VaccineCDC: 15 Percent of Americans Have Had H1N1 FluSwine Flu Has Infected 1 in 6 Americans: CDCPandemic Flu Could Lead to Shortages in Blood SupplySeasonal Flu Vaccination Rates Still Too LowReview Questions Tamiflu's EffectivenessSwine Flu Pandemic May Be Less Severe Than ExpectedSwine Flu Can Batter Kids With Sickle CellSwine Flu Continues to WaneH1N1 Influenza Rates Drop in Many StatesSwine Flu Waning, But Could ReturnU.S. Swine Flu Cases Chart Sharp DeclineGeneral Population May Have Some Immunity to Swine FluSwine Flu Tied to Rise in Pneumonias Among YoungWinter Flu May Push Pediatric Intensive Care to LimitSwine Flu Declining in Some Parts of U.S.Swine Flu May Hit Kids With Asthma HarderClinical Trials Update: Nov. 20, 2009Trivalent Vaccine Has Minimal Effect on H1N1Clinical Trials Update: Nov. 17, 2009Immunity to Swine Flu May Be Broader Than ThoughtAnother Swine Flu Vaccine Approved for ChildrenCDC: New H1N1 Tracking Method Ups Estimates22 Million Sickened by Swine Flu in 6 Months VideosLinks |
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Background Disease Rates Important in H1N1 Pandemic by -- Rick Ansorge Updated: Nov 2nd 2009

MONDAY, Nov. 2 (HealthDay News) -- During mass immunization with pandemic H1N1 influenza vaccines, awareness of background rates of disease is essential for assessing vaccine safety, and may help allay vaccine-associated fears among the general public, according to an article published online Oct. 31 in The Lancet.
Steven Black, M.D., of Cincinnati Children's Hospital, and colleagues identified background rates of selected medical events for several countries, and found a wide variation in the rates of disease events by age, sex, method of ascertainment, and geography.
Based on this data, the researchers estimated that the vaccination of 10 million people in the United Kingdom would be followed in six weeks by 21.5 coincident background cases of Guillain-Barre syndrome and 5.75 coincident background cases of sudden death. They also estimated that 397 out of every 1 million vaccinated pregnant women in the United States would have a miscarriage within a day of vaccination.
"Background rates can provide the media, the public, public-health officials, and politicians with important information about the expected number of events that can occur in the absence of any vaccination program," Black and colleagues conclude. "Additionally, they can be used to estimate the number of such events that will occur after immunization of any number of individuals."
Several authors reported financial relationships with GSK, Wyeth, Novartis, and Sanofi Pasteur.
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