Aflunov, approved for medical use in the European Union in November 2010. Aflunov contains the flu strain A/turkey/Turkey/1/2005 (H5N1)-like strain (NIBRG-23) (clade 2.2.1). Pumarix, approved for medical use in the European Union in March 2011.In November 2013, the U.S. Food and Drug Administration (FDA) approved an experimental H5N1 bird flu vaccine to be held in stockpiles. In a clinical trial including 3,400 adults, 91% of people age 18-64 and 74% of people age 65 or older formed an immune response sufficient to provide protection. Reported adverse effects were generally mild, with pain at the injection site being the most common adverse effect.H5N1 continually mutates, meaning vaccines based on current samples of avian H5N1 cannot be depended upon to work in the case of a future pandemic of H5N1. While there can be some cross-protection against related flu strains, the best protection would be from a vaccine specifically produced for any future pandemic flu virus strain. Daniel R. Lucey, co-director of the Biohazardous Threats and Emerging Diseases graduate program at Georgetown University, has made this point, "There is no H5N1 pandemic so there can be no pandemic vaccine." However, "pre-pandemic vaccines" have been created; are being refined and tested; and do have some promise both in furthering research and preparedness for the next pandemic.
Tract may refer to:

Geography and real estate
Housing tract, an area of land that is subdivided into smaller individual lots
Land lot or tract, a section of land
Census tract, a geographic region defined for the purpose of taking a census

Writings
Tract (literature), a short written work, usually of a political or religious nature
Tract (liturgy), a component of Roman Catholic liturgy
Treatise

Biology
Nerve tract, a bundle of fibers that connects different parts of the central nervous system - analogous to a nerve in the peripheral nervous system
A genetic tract, a sequence of repeating nucleotides or amino acids, such as a polyglutamine tract
A collection of related anatomic structures, such as:
Gastrointestinal tract
Genitourinary tract
Reproductive tract
A grouping of feathers, e.g. primaries, auricular, scapular

Businesses
Tract (imprint), an imprint of the German group VDM Publishing devoted to the reproduction of Wikipedia content

See also

Track (disambiguation)

All pages with titles beginning with Tract
All pages with titles containing Tract