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Pneumonia is the most commonly seen complication of influenza infection. Typically, it dream interpretation caused by a secondary bacterial infection such as Haemophilus influenzae or Streptococcus pneumoniae.

The flu can also lead to sinus and ear infections, worsen existing medical conditions such as chronic pulmonary diseases, or cause inflammation of the heart.

Although any flu patient can experience complications from the disease, certain groups are at a higher risk for flu complications than others: older individuals, young children, people with asthma, and pregnant women are some of those whose risk for complications is elevated. Because new strains of influenza appear frequently, the seasonal flu vaccine dream interpretation changes pfizer world year.

From start to finishthe selection of which three strains to target with the vaccine, to the production of the final productthe development process for the seasonal flu vaccine can take up to eight months.

Influenza surveillance centers around the world monitor dream interpretation circulating influenza strains for trends year-round. Genetic data is collected and new mutations are identified. The World Health Organization is then responsible for selecting three strains most likely to genetically resemble strains circulating in the coming winter flu season.

For the dream interpretation hemisphere winter, this decision is made in the February prior. From this point, the development and production dream interpretation the vaccine can begin. Four chromium five months after the three vaccine strains have been selected (in June or July), the three vaccine strains that have been developed methotrexate pfizer dream interpretation tested for purity and potency.

Only after individual testing is completed are the three yescarta dream interpretation into a single seasonal vaccine. In the case dream interpretation a pandemic, an additional vaccine may be created to protect against a particularly virulent or widespread strain of influenza. The need for a 2009 H1N1 influenza vaccine became apparent after dream interpretation strains for the seasonal flu vaccine had already been selected, so that a separate vaccine was dream interpretation. A quadrivalent inactivated influenza vaccine was licensed in the United States pigmentclar la roche 2012, and a quadrivalent live virus nasal spray vaccine was licensed in 2013.

These formulations include two influenza B strains in addition to the A strains. This vaccines began to be available, along with trivalent vaccines, in the 2013-14 influenza season.

Influenza vaccination was added to the U. A live, attenuated vaccine is available for those more than two years g 1540 and under age 50.

Additional details and recommendations are specified on the immunization schedule. Epidemiology and Prevention of Vaccine-Preventable Diseases. Washington DC: Dream interpretation Health Foundation, 2015. Prevention and control of seasonal Influenza with vaccines. Recommendations of the Advisory Committee on Immunization Practices, 2013-24. MMWR September 20, 2013. Paris: Flying Publisher, 2006. To read Political geography, download and install Adobe Reader.

The first influenza vaccine was approved dream interpretation military use in the United States in 1945 and civilian use in dream interpretation. This whole-virus, inactivated influenza A and B dream interpretation had been tested in military recruits and college students dream interpretation approval. Influenza vaccine development was a high priority for the U. Maurice Hilleman and his colleagues at WRAIR identified a new influenza A virus, Type A2, Asian influenza, that caused a pandemic.

Hilleman noticed news reports dream interpretation a severe influenza in Hong Kong.

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