Shingles And Its Clinical Burden
Herpes zoster (shingles) results from the reactivation of the varicella-zoster virus. It causes a painful dermatomal rash and complications such as postherpetic neuralgia (PHN). The disease is a significant concern for older adults and immunocompromised individuals in Singapore, and there is an increasing incidence due to population ageing and higher numbers of patients with immunosuppression. This article provides an overview of the Shingrix Shingles vaccine – indications, dosage, efficacy and reported adverse effects.
Shingrix Recombinant Zoster Vaccine: Overview
Product Description
Shingrix (from GSK) is a non-live, recombinant vaccine formulated with varicella-zoster virus glycoprotein E antigen adjuvanted with AS01B. It is designed to provoke a robust and long-lasting cell-mediated immune response, offering a targeted intervention against shingles in populations at risk.
Indications
- Adults aged 50 years and older, irrespective of previous herpes zoster or varicella vaccination history.
- Adults aged 19 years and older who are immunocompromised or immunosuppressed due to disease (such as HIV, malignancies) or therapy (including chemotherapy or corticosteroids).
Contraindications
- Known hypersensitivity to any vaccine component, including neomycin.
- Individuals experiencing an acute episode of shingles.
- History of severe allergic reaction (e.g., anaphylaxis) to a previous dose of Shingrix.
Dosage And Administration Instructions
- Shingrix is administered intramuscularly as a two-dose series (0.5ml each).
- The second dose is recommended two to six months after the initial dose.
- For immunocompromised individuals, the minimum interval between doses may be shortened to one month if necessary.
- Completing the two-dose series is essential for optimal and sustained protection.
Clinical Efficacy And Duration Of Protection
- Large-scale randomised controlled trials show Shingrix achieves over 90% efficacy in preventing herpes zoster and its complications in adults aged 50 years or older.
- Efficacy is maintained at over 85% in adults above 70, and demonstrates effectiveness in immunocompromised populations, although absolute efficacy rates may be lower in the latter.
- Protective immunity is sustained for at least seven years post-vaccination, with extended effectiveness being actively studied1.
Shingrix Adverse Effects And Safety Profile
Most Frequently Reported Adverse Effects
- Pain, redness, and swelling at the injection site (up to 78%)
- Muscle aches, fatigue (up to 45%)
- Headache (around 38%)
- Shivering and fever (21–27%)
- Gastrointestinal symptoms, e.g. nausea or upset stomach (up to 17%)
- Local arm mobility reduction (rare, usually short-lived)
- Injection site itching, chills, malaise, joint pain, dizziness (each ≤4%)
These symptoms are generally mild to moderate, lasting 2–3 days, and resolve without intervention.
Serious Or Uncommon Adverse Effects
Allergic And Immune-Mediated Reactions
- Severe allergic reactions (anaphylaxis, angioedema, urticaria): extremely rare
- Hypersensitivity responses (rash, swelling of the face/throat): rare but require urgent attention
Neurological Adverse Events
- Guillain-Barré Syndrome (GBS): rare post-marketing reports note a small increased risk of GBS in the 42 days after vaccination (approximately 3 excess cases per million doses administered).
- Syncope/fainting: rare, observed with other injectable vaccines as well.
Other Notable Findings
- Prolonged arm pain or reduced mobility (typically resolves within a week).
- Vaccine failure (herpes zoster infection despite vaccination) is exceedingly uncommon and not unique to Shingrix.
- Isolated, non-causal reports of gout, autoimmune conditions, and musculoskeletal symptoms; these are monitored for potential signals but remain extremely infrequent and unsubstantiated as causally related to Shingrix.
Table: Shingrix Key Adverse Effects And Reported Frequencies
| Event | Frequency/Detail | Key Sources |
| Injection site pain, redness, swelling | Very common (up to 78%) | [1][2][3][4][6] |
| Myalgia, fatigue, headache, shivering, fever | Common (17–45%) | [1][2][4][5][6] |
| Gastrointestinal symptoms (nausea, etc.) | Less common (up to 17%) | [4][5] |
| Severe allergic reaction/anaphylaxis | Extremely rare | [1][7][4][8] |
| Guillain-Barré syndrome | Very rare (3 excess cases per million doses) | [4][5][9][10] |
| Syncope (fainting) | Rare | [4][5] |
| Immune-mediated disease (e.g. polymyalgia) | Balanced incidence in vaccine and placebo groups | [11] |
| Vaccine failure (shingles infection) | Very rare | [3] |
Disclaimer
This summary provides highlights of reported adverse effects for Shingrix based on current post-marketing data and literature, presented “as is.” Many reports are based on voluntary or observational data, may not be substantiated, and might not indicate causality. New evidence may continue to emerge. Health professionals should consult updated regulatory guidance and scientific publications for the most current information.
Shingrix Cost And Availability In Singapore
- Shingrix is widely available at healthcare centres and clinics across Singapore.
- The typical cost for two doses ranges from S$720 to S$800.
Summary
Shingrix provides robust, durable protection against shingles for both immunocompetent and immunocompromised adults. Its favourable safety profile and strong efficacy make it the recommended standard of care for preventing herpes zoster and related complications in eligible populations in Singapore. Continued vigilance in adverse event reporting and ongoing review of emerging data is advised.
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