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Pneumococcal vaccine

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Pneumococcal vaccine
23-valent pneumococcal polysaccharide vaccine by MSD as it is marketed in Japan.
Vaccine description
TargetStreptococcus pneumoniae
Vaccine typeConjugate
Clinical data
AHFS/Drugs.comMonograph
ATC code
Legal status
Legal status
  • US: ℞-only
  • In general: ℞ (Prescription only)
Identifiers
ChemSpider
  • none

Pneumococcal vaccines are vaccines against the bacterium Streptococcus pneumoniae.[1] Their use can prevent some cases of pneumonia, meningitis, and sepsis.[1] There are two types of pneumococcal vaccines: conjugate vaccines and polysaccharide vaccines.[1] They are given by injection either into a muscle or just under the skin.[1]

The World Health Organization (WHO) recommends the use of the conjugate vaccine in the routine immunizations given to children.[1] This includes those with HIV/AIDS.[1] The recommended three or four doses are between 71 and 93% effective at preventing severe pneumococcal disease.[1] The polysaccharide vaccines, while effective in healthy adults, are not effective in children less than two years old or those with poor immune function.[1]

These vaccines are generally safe.[1] With the conjugate vaccine about 10% of babies develop redness at the site of injection, fever, or change in sleep.[1] Severe allergies are very rare.[1]

Whole cell vaccinations were developed alongside characterisation of the subtypes of pneumococcus from the early 1900s.[2]

The first pneumococcal vaccine was developed in the 1980s.[1] It is on the World Health Organization's List of Essential Medicines.[3]

Recommendations

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13-valent pneumococcal conjugate vaccine (Prevnar 13) produced by Pfizer Japan in 2013.

Worldwide

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Pneumococcal vaccines Accelerated Development and Introduction Plan (PneumoADIP) is a program to accelerate the evaluation and access to new pneumococcal vaccines in the developing world. PneumoADIP is funded by the Global Alliance for Vaccines and Immunization (GAVI). Thirty GAVI countries have expressed interest in participating by 2010. PneumoADIP aims to save 5.4 million children by 2030.[4]

A pilot Advance Market Commitment (AMC) to develop a vaccine against pneumococcus was launched by GAVI in June 2009 as a strategy to address two of the major policy challenges to vaccine introduction: a lack of affordable vaccines on the market, and insufficient commercial incentives to develop vaccines for diseases concentrated in developing countries. Under the terms of an AMC, donors make a legally binding guarantee that, if a future vaccine is developed against a particular disease, they will purchase a predetermined amount at an agreed-upon price. The guarantee is linked to safety and efficacy standards that the vaccine must meet and is structured in a way to allow several firms to compete to develop and produce the best possible new product. AMCs reduce risk to donor governments by eliminating the need to fund individual research and development projects that may never produce a vaccine. If no company produces a vaccine that meets the predetermined standards, governments (and thus their taxpayers) spend nothing. For the bio-pharmaceutical industry, AMCs create a guaranteed market, with a promise of returns that would not normally exist. For developing countries, AMCs provide funding to ensure that those vaccines will be affordable once they have been developed. It is estimated that the pneumococcal AMC could prevent more than 1.5 million childhood deaths by 2020.[5][third-party source needed]

Doctors Without Borders has criticized GAVI's pneumococcal AMC for not encouraging innovation, discouraging competition from new market entrants, and raising vaccine costs. They said that it had allowed Pfizer and GlaxoSmithKline to maintain a duopoly, while making it more difficult for the Serum Institute of India to sell their cheaper vaccine. The duopoly allowed price discrimination; somewhat higher prices for GAVI, and unaffordable prices (about ten time the GAVI price) for middle-income countries too rich for GAVI aid.[6] The pneumococcal program (unlike previous market-shaping programs from GAVI[7][third-party source needed]) did not include any mechanism for increasing competition.[8]

The Humanitarian Mechanism makes the pneumococcal vaccine available to humanitarian actors (but not governments) at a lower than normal price during humanitarian emergencies.[9]

Belgium

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The national vaccination program started vaccinating newborns in 2004 with the 7-valent pneumococcal conjugate vaccine (PCV 7). This was changed into the 13-valent conjugate (PCV 13) in 2011. The switch to the 10-valent conjugate (PCV 10) was made in July 2015 in Flanders and May 2016 in Wallonia.[10] In late 2020 a start was made with the vaccination of care home residents with the 23-valant pneumococcal polysaccharide vaccine (PPV 23).[11]

Canada

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Health Canada's general recommendations are 13-valent pneumococcal conjugate vaccine (PCV 13) vaccine for children aged 2 months to 18 years and 23-valent pneumococcal polysaccharide vaccine (PPV 23) vaccine for adults.[12]

India

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In May 2017, the Government of India decided to include pneumococcal conjugate vaccine in its Universal Immunization Programme.[13]

The Netherlands

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The national vaccination program started including the pneumococcal vaccine for newborns in April 2006.[14]

The Health Council advised in 2018 that those who are over the age of 60 should also be vaccinated on a 5-year recurring schedule. The resulting program from this, NPPV, started at the end of 2020.[15]

Health authorities reported in December 2020 that former COVID-19 patients also have an indication for this vaccine because of the damage their lungs incurred. Vaccinating this group is not part of the NPPV program.[16]

South Africa

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The 7- and 13-valent pneumococcal conjugate vaccines (PCV7 and PCV13) were introduced into the national Expanded Program on Immunization (EPI) in South Africa in 2009 and 2011, respectively. South Africa became the first African country – and the first nation in the world with a high HIV prevalence – to introduce PCV7 into its routine immunization program.[17] Rates of invasive pneumococcal disease (IPD) – including cases caused by antibiotic-resistant bacteria – have fallen substantially in South Africa following the introduction of PCV7. Among children under two years of age, the overall incidence of IPD declined nearly 70% after PCV introduction, and rates of IPD caused by bacteria specifically targeted by the vaccine decreased nearly 90%.[18] Due to the indirect protection conferred by herd immunity, a significant decline in IPD in children and in unvaccinated adults has also been shown.[18]

Pneumovax 23 is used for all ages and, according to the enclosed patient information leaflet, has a reported 76% to 92% protective efficacy (pneumococcal types 1, 2, 3, 4, 5, 6B**, 7F, 8, 9N, 9V**, 10A, 11A, 12F, 14**, 15B, 17F, 18C, 19A**, 19F**, 20, 22F, 23F** and 33F** are included, where ** indicates drug-resistant pneumococcal infections; these are the 23 most prevalent or invasive pneumococcal types of Streptococcus pneumoniae).[medical citation needed]

United Kingdom

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It was announced in February 2006, that the UK government would introduce vaccination with the conjugate vaccine in children aged 2, 4 and 13 months.[19][20] This included changes to the immunisation programme in general.[21] In 2009, the European Medicines Agency approved the use of a 10 valent pneumococcal conjugate vaccine for use in Europe.[22] The 13-valent pneumococcal vaccine was introduced in the routine immunization schedule of the UK in April 2010.[citation needed]

United States

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Diagram with visual representation of the current indications for both the Prevnar and the Pneumovax.[23]

In the United States, a heptavalent pneumococcal conjugate vaccine (PCV 7) (e.g. Prevnar, called Prevenar in some countries[24]) was recommended for all children aged 2–23 months and for at-risk children aged 24–59 months in 2000. The normal four-dose series is given at 2, 4, 6 and 12–14 months of age. In February 2010, a pneumococcal conjugate vaccine which protects against an additional six serotypes was introduced (PCV 13/brand name: Prevnar 13) and can be given instead of the original Prevnar.[25][26] On 10 June 2021, a pneumococcal conjugate vaccine which protects against 20 serotypes was approved with the brand name Prevnar 20.[27] In April 2023, the FDA approved the use of Prevnar 20 vaccine to prevent pneumococcal disease in children aged six weeks to 17 years.[28][29][30]

Mechanism

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Polysaccharide vaccine

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The pneumococcal polysaccharide vaccine most commonly used today [citation needed] consists of purified polysaccharides from 23 serotypes (1, 2, 3, 4, 5, 6b, 7F, 8, 9N, 9V, 10A, 11A, 12F, 14, 15B, 17F, 18C, 19A, 19F, 20, 22F, 23F, and 33F).[31] Immunity is induced primarily through stimulation of B-cells which release IgM[31] without the assistance of T cells.[32]

This immune response is less robust than the response provoked by conjugated vaccines, which has several consequences. The vaccine is ineffective in children less than 2 years old, presumably due to their less mature immune systems.[31] Non-response is also common amongst older adults.[31] Immunity is not lifelong, so individuals must be re-vaccinated at age 65 if their initial vaccination was given at age 60 or younger.[31] Since no mucosal immunity is provoked, the vaccine does not affect carrier rates, promote herd immunity, or protect against upper or lower respiratory tract infections.[31] Finally, provoking immune responses using unconjugated polysaccharides from the capsules of other bacteria, such as H. influenzae, has proven significantly more difficult.[31]

Conjugated vaccine

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The pneumococcal conjugate vaccine consists of capsular polysaccharides covalently bound to the diphtheria toxoid CRM197, which is highly immunogenic but non-toxic.[31] This combination provokes a significantly more robust immune response by recruiting CRM197-specific type 2 helper T cells, which allow for immunoglobulin type switching (to produce non-IgM immunoglobulin) and production of memory B cells.[31] Among other things, this results in mucosal immunity and the eventual establishment of lifelong immunity after several exposures.[31] The main drawbacks to conjugated vaccines are that they only provide protection against a subset of the serotypes covered by the polysaccharide vaccines.[medical citation needed] depitte, J.; Gove, Sandy; Breiman, Robert F.

Research

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Due to the geographic distribution of pneumococcal serotypes, additional research is needed to find the most efficacious vaccine for developing-world populations. In a previous study, the most common pneumococcal serotypes or groups from developed countries were found to be, in descending order, 14, 6, 19, 18, 9, 23, 7, 4, 1 and 15. In developing countries, the order was 6, 14, 8, 5, 1, 19, 9, 23, 18, 15 and 7.[33] In order to further pneumococcal vaccine research and reduce childhood mortality, five countries and the Bill & Melinda Gates Foundation established a pilot Advance Market Commitment for pneumococcal vaccines worth US$1.5 billion. Advance Market Commitments are a new approach to public health funding designed to stimulate the development and manufacture of vaccines for developing countries.[34]

There is research into producing vaccines than can be given into the nose rather than by injection.[35][36] It is believed that this improves vaccine efficacy and also avoids the need for injection.[medical citation needed]

The development of serotype-specific anticapsular monoclonal antibodies has also been researched in recent years. These antibodies have been shown to prolong survival in a mouse model of pneumococcal infection characterized by a reduction in bacterial loads and a suppression of the host inflammatory response.[37][38] Additional pneumococcal vaccine research is taking place to find a vaccine that offers broad protection against pneumococcal disease.[39]

As of 2017, pneumonia vaccines target up to 23 forms of the bacterium that cause pneumonia with a new version under development covering 72 strains of the bacterium.[40][needs update]

References

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  1. ^ a b c d e f g h i j k l World Health Organization (April 2012). "Pneumococcal vaccines WHO position paper--2012". Weekly Epidemiological Record. 87 (14): 129–144. hdl:10665/241904. PMID 24340399.
  2. ^ Grabenstein JD, Klugman KP (October 2012). "A century of pneumococcal vaccination research in humans". Clinical Microbiology and Infection. 18 (Suppl 5): 15–24. doi:10.1111/j.1469-0691.2012.03943.x. PMID 22882735. S2CID 25558809.
  3. ^ World Health Organization (2023). The selection and use of essential medicines 2023: web annex A: World Health Organization model list of essential medicines: 23rd list (2023). Geneva: World Health Organization. hdl:10665/371090. WHO/MHP/HPS/EML/2023.02.
  4. ^ "Vaccine Fund". PneumoADIP. Global Alliance for Vaccines and Immunization (GAVI); Johns Hopkins Bloomberg School of Public Health. Archived from the original on 8 February 2011.
  5. ^ "Pneumococcal Advance Market Commitment (AMC)". GAVI. Archived from the original on 7 June 2013.
  6. ^ Photography by Apostolia S (3 December 2019). "Gavi must stop giving millions in subsidies to Pfizer and GSK for pneumococcal vaccine". Doctors Without Borders. Archived from the original on 2 August 2022.
  7. ^ Malhame M, Baker E, Gandhi G, Jones A, Kalpaxis P, Iqbal R, et al. (August 2019). "Shaping markets to benefit global health - A 15-year history and lessons learned from the pentavalent vaccine market". Vaccine. 2: 100033. doi:10.1016/j.jvacx.2019.100033. PMC 6668221. PMID 31384748.
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  9. ^ Photograph by Ekholm K (2015). "Vaccination". Doctors Without Borders. Archived from the original on 27 June 2022.
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  19. ^ "Children to be given new vaccine". BBC News. 8 February 2006. Archived from the original on 30 May 2006.
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  21. ^ "Changes to the immunisation programme in the UK". Meningitis Research Foundation. Archived from the original on 13 July 2007. Retrieved 6 May 2017.
  22. ^ "Synflorix, GlaxoSmithKline's pneumococcal vaccine receives European authorisation" (Press release). GlaxoSmithKline. 31 March 2009. Archived from the original on 4 August 2009.
  23. ^ "Pneumococcal Vaccination: Information for Health Care Providers". Centers for Disease Control and Prevention (CDC). 11 July 2016. Archived from the original on 23 July 2016. Retrieved 26 July 2016.
  24. ^ "Prevenar — Annex I: Summary of Product Characteristics" (PDF). European Medicines Agency. Archived from the original (PDF) on 17 December 2008.
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  26. ^ "Prevnar 13". U.S. Food and Drug Administration (FDA). 12 January 2012. STN: 125324. Archived from the original on 18 August 2011.
  27. ^ "Prevnar 20". Food and Drug Administration. 10 June 2021. Archived from the original on 6 September 2022. Retrieved 20 June 2021.
  28. ^ "FDA Greenlights Pfizer's Pneumococcal Vaccine in Infants and Children". BioSpace. 28 April 2023. Archived from the original on 3 May 2023. Retrieved 3 May 2023.
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  30. ^ "Supplemental Approval: 20-valent Pneumococcal Conjugate Vaccine (PREVNAR 20)". Food and Drug Administration. 27 April 2023. Archived from the original on 1 May 2023. Retrieved 12 May 2023.
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  32. ^ Stein KE (June 1992). "Thymus-independent and thymus-dependent responses to polysaccharide antigens". The Journal of Infectious Diseases. 165 (Suppl 1): S49–S52. doi:10.1093/infdis/165-supplement_1-s49. PMID 1588177.
  33. ^ Sniadack DH, Schwartz B, Lipman H, Bogaerts J, Butler JC, Dagan R, et al. (June 1995). "Potential interventions for the prevention of childhood pneumonia: geographic and temporal differences in serotype and serogroup distribution of sterile site pneumococcal isolates from children--implications for vaccine strategies" (PDF). The Pediatric Infectious Disease Journal. 14 (6): 503–510. doi:10.1097/00006454-199506000-00007. PMID 7667055. Archived from the original on 28 August 2021.
  34. ^ "Saving Lives with New Vaccines: Advance Market Commitments". Advance Market Commitments for Vaccines (vaccineAMC). GAVI. November 2012. Archived from the original (PDF) on 6 March 2016.
  35. ^ Hanniffy SB, Carter AT, Hitchin E, Wells JM (January 2007). "Mucosal delivery of a pneumococcal vaccine using Lactococcus lactis affords protection against respiratory infection". The Journal of Infectious Diseases. 195 (2): 185–193. doi:10.1086/509807. PMID 17191163.
  36. ^ Malley R, Lipsitch M, Stack A, Saladino R, Fleisher G, Pelton S, et al. (August 2001). "Intranasal immunization with killed unencapsulated whole cells prevents colonization and invasive disease by capsulated pneumococci". Infection and Immunity. 69 (8): 4870–4873. doi:10.1128/IAI.69.8.4870-4873.2001. PMC 98576. PMID 11447162.
  37. ^ Burns T, Abadi M, Pirofski LA (August 2005). "Modulation of the lung inflammatory response to serotype 8 pneumococcal infection by a human immunoglobulin m monoclonal antibody to serotype 8 capsular polysaccharide". Infection and Immunity. 73 (8): 4530–4538. doi:10.1128/IAI.73.8.4530-4538.2005. PMC 1201218. PMID 16040964.
  38. ^ Fabrizio K, Groner A, Boes M, Pirofski LA (April 2007). "A human monoclonal immunoglobulin M reduces bacteremia and inflammation in a mouse model of systemic pneumococcal infection". Clinical and Vaccine Immunology. 14 (4): 382–390. doi:10.1128/CVI.00374-06. PMC 1865609. PMID 17301214.
  39. ^ "Acute Respiratory Infections (Update September 2009): Streptococcus pneumoniae". Initiative for Vaccine Research (IVR). World Health Organization (WHO). Archived from the original on 23 May 2012.
  40. ^ Jones CH, Zhang G, Nayerhoda R, Beitelshees M, Hill A, Rostami P, et al. (October 2017). "Comprehensive vaccine design for commensal disease progression". Science Advances. 3 (10): e1701797. Bibcode:2017SciA....3E1797J. doi:10.1126/sciadv.1701797. PMC 5647123. PMID 29057325.; Lay summary in: "The end of pneumonia? New vaccine offers hope: Vaccine under development provides the 'most comprehensive coverage' to date and alleviates antimicrobial concerns, new study finds". ScienceDaily. 20 October 2017. Archived from the original on 8 August 2022. Retrieved 12 July 2018.

Further reading

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