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Toolbox  –  Measure

Infections

Antibiotic use is closely linked to the prevalence of infections. It is important to monitor the general disease patterns and bacterial outbreaks within the health care setting, in the community and among animals, as well as resistance levels in the pathogens, to be able to address the problem of antibiotic resistance efficiently.

Why monitor infections?

Infectious diseases drive much of the antibiotic use in the world. In some cases, as in the treatment of sepsis and pneumonia, antibiotics are life-saving medicines. In other cases, such as in the treatment of uncomplicated upper respiratory tract infections or diarrhea, antibiotic use is often improper.

Knowing which diseases are causing the most illnesses in people and animals as well as those that require the most time and resources to cure, can guide decisions on which bacteria to include in surveillance and prevention initiatives, can help identify the sources of outbreaks and may facilitate work to make sure that the relevant diagnostic methods and correct treatments are available, to name only a few examples. Such information can also help in identifying the diseases which drive antibiotic consumption.

Infections, antibiotic use and resistance

Health care-associated infections

Health care-associated infections are infections that patients get within a healthcare facility, while receiving treatment for another condition. They can result in prolonged morbidity, in-hospital stay or even mortality for affected patients, as well as substantial excessive costs for health care and society (see more in UNDERSTAND: Antibiotic resistance – Health care-associated infections). Many of these infections are caused by resistant bacteria.

Every year around 4 million patients in Europe get a hospital-acquired infection. This leads to at least 37,000 deaths. More than 60% of these deaths are caused by antibiotic resistant bacteria. In low and middle income countries thorough estimates are more scarce. A WHO review reported a pooled prevalence of health care-associated infections around 10-15%. But data was highly variable with reports of up to 89% of patients in intensive care getting infected.

Community-acquired infections

Community-acquired infections are infections obtained in the community for example from another person, contaminated food, or from a person’s own microbiota. A common definition is that community-acquired infections give symptoms or are diagnosed in patients within 48 hours of admission to a health facility. Examples of bacterial infections that are commonly obtained in the community are tuberculosis, pneumonia, urinary tract infections and food- and waterborne infections such as salmonellosis, campylobacter and cholera.

Increasing levels of resistance have been observed in many common community-acquired infections. Typhoid fever is a life-threatening disease that spreads through contaminated food and water. Burden is estimated to 20.6 million cases and 223,000 deaths. In Pakistan, more than 5000 cases of extensively antibiotic resistant typhoid were reported between November 2016 and December 2018. The only reliable and affordable oral antibiotic remaining for treatment is azithromycin.

Foodborne and zoonotic diseases

Zoonotic diseases are diseases that can spread between animals and humans for example through contact with infected animals or by consuming contaminated food. Around 60% of all human diseases are said to have originated in animals. Every year 600 million people fall ill worldwide from foodborne diseases. More than 90 million people are affected in Africa alone..

Food is also one route of transmission of antibiotic resistant bacteria. Both zoonotic bacteria and the normal gut microbiota of the animal can carry resistance genes. These bacteria can contaminate meat during slaughter, crops where untreated animal manure has been used as fertilizer or may end up in water sources.

Clean water and good sanitation reduce incidence of infection and need for antibiotics

Most acute diarrheal diseases are self-limiting and do not require antibiotic treatment (preferred treatment oral rehydration salts). Antibiotics are recommended only for severe bacterial diarrhea. However, inappropriate use of antibiotics for diarrhea is common.

Estimates suggest that 494 million cases of diarrhea are treated with antibiotics each year in Brazil, Indonesia, India and Nigeria alone. Universal access to improved water and sanitation could reduce this number by 60%.

Diseases in food animals

Diseases are one of the key constraints to animal productivity and is a driver of antibiotic use in animal production. Common production diseases include mastitis, diarrhea in young animals and respiratory illness (such as pneumonia).

Further reading

1.
Disease outbreak news: Typhoid fever – Islamic Republic of Pakistan [Internet]. WHO. [cited 2019 Feb 12]. Available from: http://www.who.int/csr/don/27-december-2018-typhoid-pakistan/en/
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Of all human diseases, 60% originate in animals – “One Health” is the only way to keep antibiotics working [Internet]. WHO Regional Office for Europe. 2018 [cited 2019 May 20]. Available from: http://www.euro.who.int/en/health-topics/disease-prevention/food-safety/news/news/2018/11/of-all-human-diseases,-60-originate-in-animals-one-health-is-the-only-way-to-keep-antibiotics-working
1.
World Health Organization - WHO. Report on the Burden of Endemic Health Care-Associated Infection Worldwide [Internet]. 2011. Available from: http://apps.who.int/iris/handle/10665/80135
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Mogasale V, Maskery B, Ochiai RL, Lee JS, Mogasale VV, Ramani E, et al. Burden of typhoid fever in low-income and middle-income countries: a systematic, literature-based update with risk-factor adjustment. The Lancet Global Health [Internet]. 2014 [cited 2018 Nov 20];2(10):e570–80. Available from: https://linkinghub.elsevier.com/retrieve/pii/S2214109X14703018
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Review on antimicrobial resistance - Review on AMR. Infection prevention, control and surveillance: Limiting the development and spread of drug-resistance [Internet]. London; 2016 [cited 2016 Mar 23]. Available from: https://amr-review.org/Publications.html
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World Health Organization - WHO. WHO estimates of the global burden of foodborne diseases [Internet]. Geneva, Switzerland: World Health Organization; 2015 [cited 2016 Feb 25]. Available from: http://www.who.int/foodsafety/publications/foodborne_disease/fergreport/en/
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European Centre for Disease Prevention and Control - ECDC. Antimicrobial Resistance and Healthcare-associated Infections Programme [Internet]. Activities. [cited 2016 Feb 18]. Available from: http://ecdc.europa.eu/en/activities/diseaseprogrammes/ARHAI/Pages/index.aspx
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UNICEF. Pneumonia and diarrhoea: tackling the deadliest diseases for the world’s poorest children. New York: UNICEF; 2012.