from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having a valency of seven

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having seven units of attractive force or affinity; -- said of heptad elements or radicals.

from The Century Dictionary and Cyclopedia

  • In chem., equivalent to seven atoms of hydrogen in combining or saturating power: applied to an atom which can be substituted for or replaced by seven atoms of hydrogen. Also heptatomic.


from Wiktionary, Creative Commons Attribution/Share-Alike License

From hepta- + -valent


  • In the first 3 years after introduction of routine vaccination with heptavalent pneumococcal conjugate vaccine, overall invasive pneumococcal disease decreased 67% in Alaska Native children younger than 2 years from 403.2 per 100,000 in 1995-2000 to 134.3 per 100,000 per year in 2001-2003.....

    Archive 2007-05-01

  • Newswise - Infants who received heptavalent pneumococcal conjugate vaccination (PCV-7) at

    Newswise: Latest News

  • The pediatric heptavalent pneumococcal conjugate vaccine -- also known as PCV7 or by its brand name Prevnar -- is credited with a sharp drop in pneumococcal disease in the U.S., especially among children younger than two and adults older than 65. - medical news plus CME for physicians

  • Pneumococci spread through upper respiratory secretions, especially those of young children. 2 Certain serotypes disproportionately colonize young children. 3 The introduction of the pediatric heptavalent pneumococcal conjugate vaccine (PCV7; Prevnar, Wyeth) in 2000 led to a decrease in invasive pneumococcal disease among vaccinated children and reduced transmission to unvaccinated

    Medlogs - Recent stories

  • Although Streptococcus pneumoniae colonization has been inversely associated with S. aureus colonization in unvaccinated children, this and other risk factors for S. aureus carriage have not been assessed following widespread use of the heptavalent pneumococcal conjugate vaccine (PCV7).

    BioMed Central - Latest articles

  • We reviewed the epidemiology and clinical management of empyema at 8 pediatric hospitals in a period before the widespread implementation of universal infant heptavalent pneumococcal vaccine programs in Canada.

    BioMed Central - Latest articles


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