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Conjugate pneumococcal vaccines effective against pneumococcal diseases.

Vaccine Weekly

| June 02, 2004 | COPYRIGHT 2004 NewsRX. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

2004 JUN 2 - (NewsRx.com & NewsRx.net) -- Conjugate pneumococcal vaccines are effective against pediatric pneumococcal diseases.

"Children younger than age 2 years have the highest rates of invasive pneumococcal disease and play an important role in its transmission. In the United States, seven pneumococcal serotypes cause approximately 80% of invasive disease and represent approximately 60% of middle-ear isolates in children younger than age 2 years; the majority of penicillin-resistant strains are confined to these same few serogroups. Although unconjugated polysaccharide pneumococcal vaccines have demonstrated effectiveness in preventing invasive disease in adults, these vaccines fail to protect against otitis media or nasopharyngeal carriage and are poorly immunogenic in children younger than age 2 years," scientists in the United States report.

"A new generation of pneumococcal vaccines has been developed, linking the capsular polysaccharide of seven to 11 serotypes to a protein carrier," stated Katherine L. O'Brien and Mathuram Santosham at Johns Hopkins University. "The only pneumococcal vaccine approved to date for children younger than age 2 years is a seven-valent conjugate vaccine (PnCRM-7) (Prevnar; Wyeth Vaccines, Pearl River, New York), which contains serotypes 4, 6B, 9V, 14, 18C, 19F, and 23F. PnCRM-7 is more immunogenic than the polysaccharide ...

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