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...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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World Health Organisation Report on the global Tobacco Epidemic Rwanda Country profile (2017)
PQDx 0033-013-00 WHO
PQ Public Report
July/2016, version 5.0
15 January 2021
This Aide Memoire is for policy makers, immunization programme managers, infection prevention and control (IPC) focal points at national, sub-national, and facility level, as well as for health workers involved in COVID-19 vaccination delivery. This document summarizes the key IPC p...rinciples to consider and the precautions to take for safely delivering COVID-19 vaccines. The principles and recommendations provided in this document derive from World Health Organization (WHO) IPC and immunization standards and other guidance in the context of COVID-19. WHO will update these recommendations as new information becomes available. All technical guidance for COVID-19 is available online.
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PQDx 0198-071-00
WHO PQDx PR
April/2016, version 2.0
Европейскому региону ВОЗ принадлежит незавид-ное первенство среди регионов мира по количеству потребляемого алкоголя и масштабам вреда, обусловленного употребл...нием алкоголя. Это проблема, требующая решительных действий. Такие действия, даже относительно простые и малозатратные, могут привести к быстрому и существенному улучшению здоровья и благополучия населения, повышению уровня занятости и производительности труда, большей экономии ресурсов в секторе здравоохранения и социального обеспечения, большему равенству в отношении здоровья и экономического положения, более высокому уровню социальной сплоченности и вовлечения всех социальных групп в жизнь общества
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The first important change is a new priority ranking of the available medicines for MDR-TB treatment, based on a careful balance between expected benefits and harms. Treatment success for MDR-TB is currently low in many countries. This could be increased by improving access to the highest-ranked med...icines for all patients with MDR-TB.
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Technical Update
Areas of Africa endemic for Buruli ulcer (BU), caused by Mycobacterium ulcerans, also have a high prevalence of human immunodeficiency virus (HIV), with adult prevalence rates between 1% and 5% (Maps). However, there is limited information on the prevalence of BU–HIV coinfection.... Preliminary
evidence suggests that HIV infection may increase the risk of BU disease (1–3). In the Médecins Sans Frontières project in Akonolinga, Cameroon, HIV prevalence was approximately 3–6 times higher among BU patients than the regional estimated HIV prevalence (2). Similarly in Benin and Ghana, BU
patients were 8 times and 3 times respectively more likely to have HIV infection than those without BU (1, 3). Further study is needed to clarify this association and enhance knowledge about the prevalence ofBU–HIV coinfection in endemic areas.
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This Rapid Communication aims to inform national TB programmes and other stakeholders about the key implications of the latest evidence on the use of specific molecular assays as initial diagnostic tests of pulmonary and extrapulmonary TB and RR-TB, in adults and children.
WHO/HTM/HIV/2007.01 WHO/HTM/TB/2007.380
How far apart should the doses of vaccines be? What if I miss my second dose? Can I get two doses from two different manufacturers? How was safety of vaccines ensured? WHO’s Chief Scientist, Dr Soumya Swaminathan explains in Science in 5.
A review of available evidence (2016).
28-29 June 2016; Geneva, Switzerland
The END TB strategy.
PQDx 0005-005-00
WHO PQDx PR
May/2016, version 3.0
Licensed pharmaceutical products (marketing authorization) should be manufactured only by licensed manufacturers (holders of a manufacturing authorization) whose activities are regularly inspected by competent national authorities. This guide to GMP shall be used as a standard to justify GMP status,... which constitutes one of the elements of the WHO Certification Scheme on the quality of pharmaceutical products moving in international commerce, through the assessment of applications for manufacturing authorizations and as a basis for the inspection of manufacturing facilities. It may also be used as training material for government medicines inspectors, as well as for production, QC and QA personnel in the industry
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Previous advocacy efforts have achieved tangible goals in terms garnering political commitments
to increase financing for TB—as seen at the 2018 UN High-Level Meeting on TB. The challenge
now is to ensure that these commitments are actually met within a global biomedical research
ecosystem that... is designed and incentivized to prioritize the health needs of wealthy populations
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