The DTaP vaccine series is recommended to help protect against diphtheria, tetanus, and pertussis in infants and young children. Individuals susceptible to these vaccine-preventable diseases can develop life-threatening complications and even death. Since the development of universal vaccines in the 1940s, the number of reported cases from diphtheria, tetanus, and pertussis declined in the United States.
Tetanus is an infectious disease caused by neurotoxins produced by the gram-positive bacillus, Clostridium tetani. The heat resistant spores of the bacteria enter the body at mucous membranes or a breach in the skin. Toxins are formed, including a highly potent toxin called tetanospasmin. This toxin interferes with the release of neurotransmitters in the central nervous system leading to unopposed muscle contraction and spasm. There is no person to person transmission of C. tetani.
Moreover, diphtheria results from infection with by toxin-producing strains of Corynebacterium diphtheriae, gram-positive bacillus. The disease can be transmitted from person to person by droplets or close contact. The bacteria can multiply and produce the diphtheria toxin in the nasopharynx region, mucous membranes, or skin lesions. Early symptoms can include malaise, sore throat, and low-grade fever. A classic feature of respiratory diphtheria is a gray-colored pseudo-membrane that firmly adheres to the mucosal lining of nasopharynx, tonsils, or larynx. This pseudo-membrane can extend further into the nasal cavity or larynx, obstructing the airways. Cardiac and neurological complications can occur once the toxin reaches the bloodstream. Respiratory droplets or close contact can transmit diphtheria.
Pertussis is a respiratory disease, also known as whooping cough, caused by the gram-negative bacillus, Bordetella pertussis. The disease characteristically has three stages: catarrhal, paroxysmal, and convalescent. The catarrhal stage includes symptoms of coryza, mild cough, and low-grade fever. Around one to two weeks, the infected person enters the paroxysmal stage with symptoms of spasmodic coughing, posttussive vomiting, and inspiratory whoop. Symptoms slowly improve in the convalescent stage but can last for weeks to months. B. pertussis is transmittable through aerosolized droplets generated by cough or sneezing. People are most infectious at the catarrhal stage or beginning of the paroxysmal stage.
The DTaP vaccine consists of diphtheria and tetanus toxoids (inactivated toxins) and acellular pertussis antigens. The tetanus component of the vaccine is about 5 to 10 Level of flocculation (Lf) units of manufactured tetanus toxoid. The diphtheria component is a manufactured diphtheria toxoid of about 15 to 25 Lf units. The acellular pertussis component of a DTaP vaccine consists of manufactured pertussis antigens called pertussis toxin, filamentous haemagglutinin, pertactin, and fimbriae type 2 and 3.
The vaccine produces an active immune response of the body by developing antibodies and antitoxins against the toxoids and acellular pertussis antigens. The two single DTaP vaccines available in the United States and approved by the FDA are Daptacel and Infanrix.
The CDC’s Advisory Committee on Immunization Practices (ACIP) recommends administering the DTaP five-dose vaccine series for children six weeks continuing through to six years of age. Routine dose recommendations are for the following ages:
The DTaP dose is 0.5 mL and given intramuscularly. The preferred intramuscular injection site for infants to two years of age is the anterolateral aspect of the thigh. For children at three years of age and older, the preferred site is the deltoid muscle. DTaP vaccines can also be available in combination with other childhood vaccines.
Children unimmunized or incompletely immunized should receive catch-up immunizations. This process is possible with minimal intervals between doses.
The fifth dose is not necessary if the fourth dose was given by at least 4 years of age and at least four months after the third dose.
Whole-cell pertussis vaccines known as DTP vaccines, were commonly associated with local adverse events, including swelling, redness, and pain at the injection site. DTP vaccines were replaced by DTaP vaccines in the 1990s to reduce the number of these common adverse events. Less common adverse events for pertussis vaccines are seizures, hypotonic-hyporesponsive episodes, and prolonged crying.
Vaccines with tetanus toxoids can cause brachial neuritis based on case reports and studies reviewed by the World Health Organization and ACIP. The cases can be severe but are rare, and brachial neuritis is usually self-limited.
ACIP has reviewed several studies regarding a simultaneous administration of DTaP with other vaccines. An increased risk may exist for febrile seizures within 24 hours when administering the inactivated influenza vaccine along with the pneumococcal 13-valent conjugate vaccine or the DTaP vaccine. The overall risk for febrile seizures is small, with any combination of vaccines. Therefore, the ACIP recommends a simultaneous administration of these vaccines.
Severe allergic reactions or anaphylaxis after administration of the DTaP vaccine or vaccine component is considered a contraindication. Encephalopathy (coma, a decreased level of consciousness, or prolonged seizures) that occurs within seven days of DTaP administration and with no identifiable cause is also a contraindication.
ACIP reviewed studies that showed children developed a significant antibody response and antitoxin levels of the diseases after three to four doses of either Infanrix or Daptacel. The Vaccine Adverse Event Reporting System (VAERS) and Vaccine Safety Datalink (VSD) surveyed any adverse events with acellular pertussis vaccine in the United States. Overall, the studies support the safety of DTaP.
Clinicians should defer any vaccines with pertussis components in infants or children with suspected or evolving neurological disease, including seizures. Vaccination with pertussis components can begin or resume upon establishing a treatment regimen, or the condition has stabilized.
An Arthus reaction (type III hypersensitivity reaction) can occur after administration of vaccines with diphtheria toxoids or tetanus toxoids. Symptoms of the reaction include severe pain, swelling, induration, edema, hemorrhage, and occasionally necrosis. The reaction is rare after vaccine administration and resolves over time. An Arthus reaction is not a contraindication to the DTaP vaccine, but any vaccines with tetanus toxoids should be administered every 10 years.
There is no known antidote or treatment to the DTaP vaccine. Anaphylaxis can occur but is extremely rare. The reaction is treatable with an intramuscular injection of epinephrine.
Vaccine coverage is considered high among infants, children, and adolescents, but clinical data shows that adults have reduced immunity, and vaccine coverage declines with increasing age; this can result from waning immunity or non-vaccination. Vaccines with acellular pertussis do not protect for as long as the prior whole-cell pertussis vaccines. In 2005, the ACIP recommended that adolescents and adults over 10 years of age receive a single dose of tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis (TdaP) vaccine. After receipt of Tdap, the recommendation for adolescents and adults is to receive a booster dose of tetanus and diphtheria toxoids (Td) vaccine every 10 years or when indicated for wound management. [Level 1]
In 2012, to reduce the burden of pertussis in infants, ACIP recommended a dose of Tdap for women during each pregnancy. Clinical studies indicated that newborn infants of mothers vaccinated during pregnancy had higher concentrations of pertussis antibodies at birth compared to newborns of unvaccinated mothers during pregnancy. [Level 1]
In various health care settings, exposure of pertussis can occur to either healthcare providers, patients, or hospital visitors. Depending on the approach, the management of exposure or pertussis outbreak can be complicated and costly. [Level 3] Postexposure prophylaxis (PEP) is recommended for healthcare personnel in contact with persons at risk for pertussis. This prophylaxis includes antibiotic treatment with a macrolide such as azithromycin and immediate evaluation of persons with cough illness.
Vaccination programs, in general, require the efforts of an interprofessional team approach. The will be ordered by the treating physician (MD DO, NP, or PA) and often administered by nursing staff. Pharmacists will assist in dose preparation and also must know the vaccination schedules or have access to them. To be sure, all members of the healthcare team should familiarize themselves thoroughly with the various vaccination schedules. Nursing will also be in the best position to monitor for adverse events or allergic reactions, which, while rare, can occur. These events should be reported to the physician immediately. Only through this type of collaborative interprofessional care can tetanus/diphtheria/pertussis vaccines be administered most effectively for optimal results. [Level 5]
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