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Diphtheria is caused by Corynebacterium species, mostly by toxin-producing Corynebacterium diphtheriae and rarely by toxin-producing strains of C. ulcerans and C. pseudotuberculosis. The most common type of diphtheria is classic respiratory diphtheria, whereby the exotoxin produced characteristicall
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y causes the formation of a pseudomembrane in the upper respiratory tract and damages other organs, usually the myocardium and peripheral nerves. Acute respiratory obstruction, acute systemic toxicity, myocarditis and neurologic complications are the usual causes of death. The infection can also affect the skin (cutaneous diphtheria). More rarely, it can affect mucous membranes at other non-respiratory sites, such as genitalia and conjunctiva.
C. diphtheriae is transmitted from person to person by intimate respiratory and direct contact; in contrast, C. ulcerans and C. pseudotuberculosis are zoonotic infections, not transmitted person-to-person. The incubation period of C. diphtheriae is two to five days (range 1– 10 days). A person is infectious as long as virulent bacteria are present in respiratory secretions, usually two weeks without antibiotics, and seldom more than six weeks. In rare cases, chronic carriers may shed organisms for six months or more. Skin lesions are often chronic and infectious for longer periods. Effective antibiotic therapy (penicillin or erythromycin) promptly terminates shedding in about one or two days.
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This position paper supersedes the 2022 WHO position paper on malaria vaccines. It includes the updated WHO recommendations on the use of the RTS,S/AS01 and R21/Matrix-M vaccines for the reduction of malaria morbidity and mortality in children living in endemic areas, prioritizing areas of moderate
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and high malaria transmission.
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Long-term polio vaccine security – the timely, sustained, and uninterrupted supply of suitable types of affordable, quality-assured polio vaccines – is essential in the global effort to achieve and maintain a polio free world. However, fragmente
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d approaches and short-term planning pose considerable challenges to securing long-term polio vaccine security.
This framework is designed to enhance the efforts of existing structures and workstreams within the Global Polio Eradication Initiative (GPEI) and other stakeholders by improving communication and coordination on vaccine security. Ensuring vaccine security is crucial for maintaining a timely, sustained, and uninterrupted supply of affordable, quality-assured polio vaccines in the global fight to achieve and sustain a polio-free world. However, challenges such as fragmented approaches, short-term planning, a dynamic policy environment, and a diverse product pipeline present significant risks to long-term vaccine security. This framework emphasizes the need for alignment and coordination across key polio operational domains, including Poliovirus Containment, Research and Development, and Vaccine Manufacturing and Supply. It also underscores the critical role of normative frameworks and policies in shaping long-term vaccine strategies that guide these operational areas. Additionally, it highlights the importance of cross-cutting elements such as financing and access to resources, along with the integration of communication, coordination, and advocacy efforts, as essential enablers for achieving vaccine security. To secure long-term vaccine supply, it is imperative to enhance alignment and strengthen coordinated efforts across workstreams and with stakeholders, including vaccine manufacturers.
Recognizing that vaccine security is an ongoing endeavor, requiring continuous monitoring and adaptation, this framework will undergo regular updates and revisions. Initially, the management of the framework will be carried out by the GPEI Vaccine Supply Group (VSG).
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WHO Secretariat Information paper July 2016
Accessed January 1, 2017
Extract from report of GACVS meeting of 3-4 December 2009, published in the WHO Weekly Epidemiological Record on 29 January 2010
Extract from report of GACVS meeting of 29-30 November 2006, published in the WHO Weekly Epidemiological Record of 19 January 2007
N Engl J Med 2018; 378:577-579; DOI: 10.1056/NEJMc1711583
A dose of oral vaccine provides effective short-term protection against cholera during an outbreak, a study in Zambia shows.
According to researchers, a shortage in the global stockpile o
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f cholera vaccines meant that single-dose oral vaccination was necessary to tackle an outbreak in Lusaka, Zambia, in February 2016. The emergency vaccination campaign was implemented in April 2016, targeting more than 500,000 people in Lusaka’s overcrowded township areas.
The 2016 outbreak happened when Zambia had not reported a case of cholera in four years.
To determine the effectiveness of the single-dose cholera vaccine, the researchers enrolled 66 patients with confirmed cholera and 330 people without the disease who were neighbours of the patients.
According to the study the effectiveness of the single dose vaccination was about 90 per cent.
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The current SEARVAP (South-East Asia regional vaccine action plan) describes a set of regional goals and objectives for immunization and control of vaccine-preventable diseases for 2016 – 2020 and
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highlights priority actions, targets and indicators that address the specific needs and challenges of countries in the Region.
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Available in English, French, Portuguese and Arabic
Successful immunization of a critical mass of the African population with one or several safe and efficacious COVID-19 vaccines.Key objectives1. Accelerate African involvement in the clinical development of a
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vaccine. 2. Ensure African countries can access a sufficient share of the global vaccine supply.3. Remove barriers to widespread delivery and uptake of effective vaccines across Africa.
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تطوير لقاح مرض فيروس كورونا ] واستراتيجية المستجد [COVID-19
Learn about the science behind the new coronavirus vaccine made by Pfizer. This video goes over how vaccines work, and how the Pfizer vaccine is a bit different from most other virus vaccines.
Comment The Lancet Volume 397, ISSUE 10269, P72-74, January 09, 2021
Published:December 08, 2020DOI:https://doi.org/10.1016/S0140-6736(20)32623-4
