Pentacel

Pentacel. It is a combination vaccine indicated for active immunization against diphtheria, tetanus, pertussis, poliomyelitis, and invasive disease caused by Haemophilus influenzae type b in children from six weeks through four years of age. Manufactured by Sanofi Pasteur, it is designed to reduce the number of injections required in the primary infant immunization series, thereby improving compliance with the recommended vaccination schedule set by advisory bodies like the Advisory Committee on Immunization Practices.

Composition and formulation

Pentacel is supplied as a kit containing two vials: a lyophilized pellet of Haemophilus influenzae type b conjugate vaccine and a liquid suspension of Diphtheria and tetanus toxoids and acellular pertussis adsorbed combined with Inactivated poliovirus vaccine. The Haemophilus influenzae type b component is conjugated to tetanus toxoid, while the acellular pertussis portion contains inactivated pertussis toxins and antigens such as pertactin and filamentous hemagglutinin. The liquid DTaP-IPV component contains aluminum phosphate as an adjuvant to enhance the immune response, along with 2-phenoxyethanol and formaldehyde as preservatives and inactivating agents.

Indications and usage

This vaccine is approved for the primary and booster immunization of infants and children against the five target diseases. It is specifically indicated for administration as a four-dose series at two, four, six, and between fifteen to eighteen months of age, aligning with the childhood immunization guidelines from the Centers for Disease Control and Prevention. Pentacel is not indicated for children after their fifth birthday or for use as a booster dose following a primary series completed with other vaccine products, such as Pediatrix or Kinrix.

Administration and dosage

Each dose is administered as a 0.5 mL intramuscular injection, typically into the vastus lateralis muscle of the thigh in infants or the deltoid muscle of the upper arm in older children. The lyophilized Haemophilus influenzae type b conjugate pellet must be reconstituted with the entire contents of the accompanying DTaP-IPV liquid suspension vial immediately prior to administration. The immunization series consists of four doses, and the vaccine should not be used interchangeably with single-antigen vaccines or other combination products from different manufacturers, such as GlaxoSmithKline.

Clinical efficacy and immunogenicity

Clinical trials conducted by Sanofi Pasteur demonstrated that Pentacel elicited protective antibody responses comparable to separately administered licensed vaccines for each component. Studies published in journals like The Pediatric Infectious Disease Journal showed high seroconversion rates against poliovirus types 1, 2, and 3 and protective levels of anti-polyribosylribitol phosphate antibodies for Haemophilus influenzae type b. The vaccine's efficacy against pertussis was consistent with other acellular pertussis vaccines, providing protection against severe disease as outlined in research from the National Institutes of Health.

Safety and adverse reactions

In pre-licensure clinical trials, the most commonly reported adverse reactions were local injection site reactions, including erythema, swelling, and tenderness, as well as systemic events such as fever, irritability, and drowsiness. Serious adverse events, such as hypotonic-hyporesponsive episode or seizure, were rare and consistent with the safety profile of other routine childhood vaccines. Post-marketing surveillance coordinated through the Vaccine Adverse Event Reporting System continues to monitor safety, with no unexpected patterns identified.

Storage and handling

The vaccine must be stored refrigerated between 2°C and 8°C and protected from light; it should not be frozen. The reconstituted vaccine should be used immediately but can be held at room temperature for up to 24 hours if necessary. Unused product must be discarded according to standard biomedical waste protocols. Healthcare providers are advised to consult the full prescribing information from Sanofi Pasteur for detailed storage guidelines and stability data. Category:Vaccines Category:Sanofi