Antibiotic resistance: A Global threat and an unseen pandemic

Written By Sanjogta Thapa Magar, Food Microbiologist, Kathmandu Metropolitan Office
Introduction
People have been using medicine to combat infectious diseases for ages, and it is widely used in medical practices; however, now it has become ineffective against microorganisms as they have developed resistance to the drugs. This unresponsiveness exhibited by microbes towards antibiotic medications is known as antimicrobial resistance (AMR). A breakthrough in antibiotic research in the 20th century marked a turning point in medical history, safeguarding millions of lives from pathogenic diseases. However, at present, it has become a persistent global public health concern, as it is anticipated to cause 10 million deaths per year by 2050. Throughout the past three decades, a considerable disparity has been documented in the enhancement of antimicrobial drugs, leading to a decline in the antibiotic revolution period due to antimicrobial resistance (AMR). Microorganisms (bacteria, fungi, viruses, and parasites) have adapted and developed tolerance against antibiotics that used to abolish them. Antibiotics were dominant against them; however, in the current scenario, the microbes are showing lower sensitivity or resistance. Therefore, a concentration exceeding typical levels of the same drug is required to have the same effect in similar cases. Recent studies have confirmed that AMR exists because of escalated use and misuse of antibiotics over the years, giving rise to a threat to global public health as a silent pandemic.
Why is it alarming?
Antimicrobial resistance (AMR) is a widely recognized health issue with public ramifications, causing high mortality rates and escalating healthcare costs. It erodes the efficacy of antimicrobial medicines, resulting in being unable to control diseases. When bacteria or other pathogens become resistant, infections are prolonged, leading to harder treatment and further expanding the probability of them spreading. The cost of treatment will rise to an exorbitant level since standard drugs no longer work. Novel medical procedures like organ transplants and cancer treatments likely rely on antibiotics, which leads to resistance. In addition, endurance against antibiotics depends on the types of pathogens (like bacteria and fungi) and is directed by variables including the quality of hygiene and sanitation. Another factor that elevated the spread of resistant pathogens is global trade and tourism across borders. As a result, developing countries may suffer economically due to reduced import and export activities linked to AMR concerns.
Examples of antibiotic resistance
When a drug is incompetent to inhibit bacterial growth effectively, it results in AMR. Microbes become ‘resistant’ and carry on with their growth despite being under the influence of antibiotics. After the introduction of new antimicrobial compounds, the evolution of AMR was monitored. AMR has occurred as a nature’s filter process where nature empowers all bacteria with low-level resistance For example, a has study confirmed that sulfamethoxazole and trimethoprim (TMP-SMZ), ampicillin and tetracycline were commonly used in former years for treatment, but now they are capable of treating non-cholera diarrhea disease in Thailand. Another study carried out in Bangladesh indicated the impact of the same drugs in treating them effectively. It shows that the resistance was reported even before the commencement of the application of antibiotics for infection treatment. Therefore, the drug tolerance demonstrated by microbes is largely due to the misuse of antibiotics.
In 1937, sulfonamides were introduced as therapeutic agents. However, now it has exhibited resistance in contrast to the microbes’ mechanism. Vancomycin was introduced 44 years ago; however, in 2002, Vancomycin-resistant Staphylococcus aureus (VRSA) was documented.
In the long run, bacteria acquire several resistance traits and become resistant to vast groups of antibiotics. As one example, Staphylococci are resistant to aminoglycosides due to chromosomal mutations, inefficient transport, and enzyme modifications. Resistance does not develop against one specific drug, but against structurally similar compounds of the same class. For example, microbes showing tolerance to tetracycline may show a sign of resistance to oxytetracycline, chlortetracycline, doxycycline, and minocycline. Analysis indicates that resistance genes developed even before antibiotics were clinically used, implying that antibiotics exhibit resistance genes that are able to withstand their antimicrobial products.
Current scenario
AMR was explicitly responsible for 6,400 deaths in Nepal in 2019, and also 23,200 deaths were registered where AMR played a role. According to the World Health Organization, Nepal ranks 52nd in the highest mortality rate due to AMR out of 204 countries. Antibiotic-resistant bacterial infections affect over 2 million people annually in the U.S due to AMR. Yearly, 33000 people die in the EU because of antibiotic-resistant bacteria.
The System behind Antibiotic Resistance Development
There are several processes used by microorganisms to become an AMR. Some mechanisms are:
- Inactivation of an antimicrobial agent by an enzyme.
- There is a production of alternative functional protein over time for the enzyme inhibited by the antimicrobial.
- Inhibition of antimicrobial agent binding due to a mutation in its target.
- Antimicrobial agents are modified after transcription or translation in a way that inhibits their binding to their targets.
- The antimicrobial agent is less likely to be absorbed.
- An antimicrobial agent is actively effluxed.
- An increase in the production of the antimicrobial agent’s target.
- In contrast to in vitro expression, in vivo suppression of a gene.
- Mechanisms that have never been recognized before.
- Microbial characteristics, environmental or human reservoirs, in which resistance genes or resistant organisms are found.
Factors that Cause AMR
Various factors assist in AMR in microorganisms. Some factors are:
- The dose of antibiotics used, the act of continuous prescribed dose, non-judicial use of medicine, and in some cases, patients asking to prescribe drugs to physicians without a valid reason, lead to the escalation of AMR.
- The Lower antibiotic concentrations and long-term treatment contribute to the rise of AMR.
- In addition to poor hygiene by hospital staff and mechanical ventilation, underlying diseases have also played a role in spreading resistant organisms.
- Antimicrobial resistance escalates when counterfeit medications contain sub therapeutic antibiotic concentrations.
- Inappropriate wastewater treatment by some pharmaceutical companies results in large amounts of antibiotics being released into the environment, resulting in the spread of antimicrobial resistance.
- Antibacterial components and antiseptics may also be contributing to AMR.
- As a contributing factor to antibiotic resistance, inappropriate antibiotic use in livestock is also found to be an underlying cause.
- It is also possible to develop a natural resistance to antibiotics. An environmental resistome is a gene that gains resistance to the environment. Resistance to antibiotics may be caused by the transfer of these genes from non-pathogenic to pathogenic microbiomes.
- This global public health hazard may also be caused by heavy metals and other pollutants.
Antimicrobial Resistance Associated with Food Producing Animals
There is a substantial relationship between the utilization of antibiotics in medicine, veterinary medicine, and agriculture and the outbreak and spread of antibiotic resistance. To be specific, for the growth stimulation of food animals, antibiotics are used widely in commercial-scale which is the main factor in the transmission of antibiotic-resistant bacteria. A significant majority of antimicrobial resistance is acquired explicitly from animals or humans that produce food. It can also be acquired obliquely through the food chain or exposure to habitats containing high levels of antimicrobial resistance pollution (such as hospitals, nosocomial acquisitions, manure, waste water, and agricultural land).
In agriculture, antibiotics are often used in the same or similar ways to antibiotics used in clinical conditions, contributing to the advancement of drug resistance. Through the food chain, antibiotic-resistant bacteria are mainly transmitted throughout animal and human populations. In some developed countries, the intake of antibiotics in food, water, or parenterally by animals is responsible for the development of antibiotic-resistant microbes.
There is an example where the use of antibiotics in cattle feed as growth promoters has increased antibiotic resistance. The evidence shows that poultry or pork might be a possible source of quinolone-resistant Escherichia coli in rural Barcelona villages, where a fourth of Juveniles harbor these organisms fecally. Quinolones, however, were never administered to these children.
Measures Taken to Overcome AMR
There are several approaches to mitigate AMR
- Educating people about antimicrobial resistance.
- The rational use of antimicrobials should be educated to the public.
- A minimum use of antimicrobials in animals, improved sanitization, and regulated use of probiotics in vaccinations and feed are vital to control common animal diseases.
- Antibiotics can be stopped safely 72 hours after symptoms have resolved.
- AMR needs to be brought to the attention of nurses and other health care providers, as they are in direct contact with patients and ultimately responsible for infection transmission.
- By granting pharmaceutical companies’ incentives for developing new antimicrobials.
- Pharmaceutical companies should follow the standards of advertising and promotion for drugs. Pharma companies should also be held accountable for encouraging the misuse of antimicrobials.
- New antibiotic categories and diagnostic technologies can only be identified through collaborative national and international academic networks.
- In addition to using antibiotics for a short period of time, regular rechecks with the doctor are necessary. As most people do not complete the entire course of treatment when no signs of clinical infection are present, the course must be stopped if no signs of infection are seen.
- Antimicrobials that are substandard or counterfeit must be controlled. New vaccines and drugs can be developed as inducements.
Combating Foodborne Antimicrobial Resistance (AMR) in Nepal: A Youth-Led Advocacy and Capacity Building Initiative
The government is taking a One Health approach (Illness, death, and their impact on the economy). Nepal has officially sanctioned the National Action Plan (NAP) to counter the escalating threat of Antimicrobial Resistance (AMR). Through a One Health approach, the Government of Nepal has aimed to deal with AMR. They are working across human health, animal health, and environmental sectors to mitigate the perilous risk associated with AMR. The NAP emphasizes mitigating the morbidity, mortality, and socio-economic burden pertinent to AMR through five strategic foundations:
- Enhancing awareness and education of the food chain.
- Consolidating integrated surveillance systems for data generation, analysis, and utilization.
- Restricting infection statistics through robust prevention and control strategies.
- Managing the utilization of antimicrobials in human, animal, and environmental sectors.
- Promoting sustainable investment, research, and innovation for AMR containment.
The transmission of drug-resistant microbes to humans through food is a critical concern. Therefore, it is a necessity for prudent antimicrobial use in agriculture and livestock sectors, as well as the significance of integrating national practices with international standards. To aid countries in handling foodborne AMR, the Codex Alimentarius has initiated an assortment of guidelines, standards, and recommendations. Despite that, various countries, including Nepal, face hardship in executing these standards due to limited resources, technical expertise, and public awareness. To overcome this, the Action to Support the Implementation of Codex AMR Texts (ACT) Project, funded by the Republic of Korea, has been implemented in Nepal by the Department of Food Safety and Quality Control (DFTQC) with technical support from FAO Nepal, has been active since 2022. The project focuses on:
- Promoting the adoption and implementation of Codex AMR texts.
- Enhancing AMR surveillance systems.
- Establishing national capacity for evidence-based governance.
- Assist in policy creation and regulatory frameworks through data-driven recommendations.
The World Food Forum (WFF) Nepal National Chapter, a part of a Global initiative, encourages young leaders in the agri-food sector through policy dialogue, advocacy, and community initiatives, where it is fostering Youth Empowerment in tackling AMR.
Conclusions and Future Perspectives
Antibiotic resistance has reached record-breaking global levels. Despite multiple programs initiated by WHO member countries, the utilization of antibiotics in humans, animals, and agriculture continues to surge. This has formed a considerable fiscal pressure on healthcare systems, the need for isolation wards, strict infection control measures, and treatment failures. Antibiotics are extensively employed in animals, which is known to be the eliciting aspect for a surge in antibiotic resistance in people. It is obligatory to use antibiotics meticulously and implement policies to ensure their accurate application, to prohibit the outbreak and spread of diseases transmitted from zoonotic epidemics. Health policymakers must develop an all-inclusive surveillance system that operates both nationally and internationally, with data analysis and obligatory reporting of antibiotic resistance cases. AMR generates a critical worldwide danger. Immediate and synchronized worldwide action is necessary.
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