When this happens, transmission from person-to-person is usually inefficient. Influenza A pandemics such as the ones in and can occur if the transmission from person-to-person becomes efficient. However, the H1N1 virus was not zoonotic swine flu because it was not transferred from pigs to humans. Instead, it spread through airborne droplets from human to human, and potentially, through human contact with inanimate objects contaminated with the virus and transferred to the eyes or nose.
Influenza Historic Timeline. April 17 Second human infection with the new influenza A H1N1 virus detected in California about miles away from first infection, with no known connection to previous patient. International Health Regulations Program. April 21 CDC publicly reported the first two U. CDC began working to develop a candidate vaccine virus.
April 23 Two additional human infections with H1N1 were detected in Texas, transforming the investigation into a multistate outbreak and response. April 24 CDC uploaded complete gene sequences of new H1N1 virus to a publically-accessible international influenza database.
April 27 WHO Director-General raised the level of influenza pandemic alert from phase 3 to phase 4, based on data showing person-to-person spread and the ability of the virus to cause community-level outbreaks. April 29 WHO raised the level of influenza pandemic alert from phase 4 to phase 5, signaling that a pandemic was imminent, and requested all countries to immediately activate their pandemic preparedness plans and be on high alert for unusual outbreaks of influenza-like illness and severe pneumonia.
CDC updated the CDC Interim Guidance on Closing Schools and Childcare Facilities , recommending affected communities with lab-confirmed cases of influenza A H1N1 consider adopting school dismissal and childcare closing measures, including closing for up to 14 days depending on the extent and severity of influenza illness.
May 5 Peak school dismissal day in the spring phase of the pandemic. May 6 CDC distributed updated recommendations for the use of influenza antiviral medicines to provide guidance for clinicians in prescribing antiviral medicines for treatment and prevention chemoprophylaxis of H1N1 influenza.
June 11 The World Health Organization WHO declared a pandemic and raised the worldwide pandemic alert level to phase 6, which means the virus was spreading to other parts of the world. The press conference had 2, participants. Virgin Islands had reported cases of H1N1 infection.
By late-June, more than 30 summer camps in the U. CDC released guidance for day and residential camps to reduce spread of influenza. In: Infectious Diseases.
Philadelphia, Pa. Accessed Nov. Flu: What to do if you get sick. Types of influenza viruses. Tosh PK expert opinion. Mayo Clinic. Influenza vaccination.
Mayo Clinic; Guide for considering influenza testing when influenza viruses are circulating in the community. Renaud DL expert opinion. Mayo Clinic, Rochester, Minn. Reye syndrome. Merck Manual Professional Version. Ibuprofen drug facts label. Food and Drug Administration. Acetaminophen oral. Prevent seasonal flu. Accessed Oct. Frequently asked influenza flu questions: season. Recommendations for prevention and control of influenza in children, Sullivan JE, et al. Clinical report — Fever and antipyretic use in children.
Reaffirmed July Labeling of drug preparations containing salicylates.
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