SII DIPTHERIA AND TETANUS VACCINE ADSORBED (PAEDIATRIC)

Indications

• Diphtheria prevention through vaccination
• Management of diphtheria infections
• Treatment of complications arising from diphtheria toxin

Dosage

Children: Refer to established guidelines for the management of diphtheria in children. Treatment typically includes administration of diphtheria antitoxin and antibiotics.

Adults: Refer to established guidelines for the management of diphtheria. Treatment typically includes administration of diphtheria antitoxin and antibiotics.

Mechanism of action

Corynebacterium diphtheriae produces diphtheria toxin, which is a potent exotoxin that inhibits protein synthesis in host cells. The toxin binds to the heparin-binding epidermal growth factor (HB-EGF) receptor on cell membranes, facilitating its entry into cells. Once inside, it catalyzes the ADP-ribosylation of elongation factor-2 (EF-2), halting protein synthesis and leading to cell death.

Pharmacodynamics

The toxicity of diphtheria is primarily due to the action of its exotoxin. The severity of the disease is correlated with the amount of toxin produced, which can lead to local tissue necrosis in the throat, systemic effects such as myocarditis and neuropathy, and can be fatal if untreated. The immune response to the toxin plays a crucial role in recovery, as patients who have been previously vaccinated may exhibit milder disease due to pre-existing immunity.

Pharmacokinetics

The pharmacokinetics of diphtheria toxin involve its release into the bloodstream after local infections in the throat. The toxin can disseminate to various tissues, including the heart and nervous system, leading to systemic manifestations. The half-life of the toxin is not well established, but it is rapidly cleared from circulation following the development of antibodies in the host, which neutralize the toxin's effects.

Adverse effects

• Local reactions at the injection site
• Fever
• Fatigue
• Allergic reactions
• Anaphylaxis (rare)

Precautions

• History of severe allergic reactions to diphtheria toxoid or any component of the vaccine
• Use with caution in individuals with immunocompromised conditions

Pregnancy

Diphtheria vaccination is generally considered safe during pregnancy and is recommended to protect both the mother and fetus from potential exposure.

Breast-feeding

Diphtheria vaccination is safe during breastfeeding and is recommended as it helps to protect the infant.

Storage

Store in a refrigerator at 2-8 degrees Celsius. Do not freeze.

Formulations

• Diphtheria toxoid vaccine (inactivated)
• Diphtheria-tetanus-pertussis (DTP) combination vaccine

Indications

• Tetanus prophylaxis
• Treatment of tetanus infection
• Management of tetanus symptoms

Dosage

Children: Refer to the specific guidelines for tetanus immunoglobulin and other supportive treatments as per clinical protocols.

Adults: Refer to the specific guidelines for tetanus immunoglobulin and other supportive treatments as per clinical protocols.

Mechanism of action

The tetanus toxin binds to the presynaptic membrane of motor neurons and is transported retrogradely to the spinal cord, where it interferes with neurotransmitter release, particularly inhibiting the release of glycine and gamma-aminobutyric acid (GABA), leading to unopposed motor neuron activity and resultant muscle rigidity and spasms.

Pharmacodynamics

Tetanus toxin is one of the most potent toxins known, with effects that can manifest within hours of exposure. The toxin's ability to block inhibitory neurotransmitter release results in a state of continuous muscle contraction, known as tetany. The clinical presentation of tetanus includes trismus (lockjaw), muscle rigidity, and autonomic instability, among others.

Pharmacokinetics

The pharmacokinetics of tetanus toxin are complex due to its high potency and the nature of its action. Following entry into the body, the toxin binds to nerve endings and is internalized, leading to its effects on neurotransmitter release. The half-life of the toxin is not well defined as it does not circulate freely in the bloodstream but acts locally at the neuromuscular junction. Recovery from the effects of the toxin may take weeks to months, depending on the severity of the infection and the treatment provided.

Adverse effects

• Pain at the injection site
• Fever
• Fatigue
• Headache
• Nausea

Precautions

• Ensure patient is up to date with vaccinations
• Monitor for allergic reactions post-vaccination
• Consider history of neurological disorders

Pregnancy

Tetanus vaccination is considered safe during pregnancy and is recommended to protect both the mother and the newborn.

Breast-feeding

Tetanus vaccination is safe during breastfeeding and does not affect the nursing infant.

Storage

Store in a refrigerator at 2–8 degrees Celsius. Do not freeze.

Formulations

• Tetanus toxoid vaccine