Benchmarking AWaRe: estimating optimal levels of AWaRe antibiotic use in 186 countries, territories and areas based on clinical infection and resistance burden
This study establishes the first standardized, benchmarking-based methodology to estimate optimal national levels of total and AWaRe-classified antibiotic use for 186 countries based on local infection and resistance burdens, revealing that while the global 70% Access target is appropriate, most countries currently overuse Watch antibiotics compared to these evidence-based targets.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of a preprint that has not been peer-reviewed. It is not medical advice. Do not make health decisions based on this content. Read full disclaimer
The Big Picture: A Global "Prescription" for Antibiotics
Imagine the world has a massive, shared medicine cabinet containing over 250 different types of antibiotics. To keep this cabinet organized and safe, the World Health Organization (WHO) sorted these medicines into three labeled jars:
- Access: The everyday, safe, first-choice medicines (like a standard bandage or painkiller).
- Watch: Stronger medicines that need a bit more care, used when the first choice doesn't work or for specific serious bugs.
- Reserve: The "super-heroes" or "nuclear option," saved only for the toughest, most resistant infections.
The United Nations recently set a goal: By 2030, at least 70% of all antibiotics used globally should come from the "Access" jar.
However, the paper points out a problem: Just looking at the percentage (70%) is like judging a family's grocery bill only by the ratio of apples to oranges. A rich family might buy 90% apples and 10% oranges, while a struggling family might buy 70% apples and 30% oranges, but the struggling family might actually be starving because they can't afford enough food at all. Similarly, some countries might meet the 70% target but still be using too many "Watch" drugs, while others might be using too few "Access" drugs because they can't get them.
What This Study Did: The "Peer Group" Approach
The researchers wanted to answer a specific question: "What is the perfect amount of medicine a country should be using, based on how sick its people are and how strong the germs are?"
To do this, they didn't just guess. They used a clever method called Benchmarking, which works like this:
- Grouping Neighbors: They took 186 countries and sorted them into four "peer groups" (like school classes) based on how rich they are, how many people get sick, and how strong the germs are.
- Group 1 & 2: Lower-income countries with higher infection rates.
- Group 3 & 4: Higher-income countries with generally lower infection rates.
- Finding the "Star Student": Inside each group, they looked for the country that was doing the best job. This "Star Student" had low death rates from infection but wasn't wasting medicine. They used this country as a benchmark (a gold standard).
- Calculating the Ideal: They asked: "If the other countries in this group treated their sick people exactly like the 'Star Student' does, how much medicine would they need?"
They calculated this for every single country, breaking it down by the three jars (Access, Watch, Reserve).
The Main Findings: The "Ideal" vs. The "Reality"
1. The Global Ideal:
If the whole world treated infections perfectly in 2019, they would have needed about 43 billion doses of antibiotics.
- The Mix: About 76% of these doses should have been from the "Access" jar. This supports the UN's 70% goal, confirming it is a good target.
- The Difference: The study found that poorer countries (Groups 1 & 2) actually need more "Watch" and "Reserve" medicines than richer countries because their infections are often harder to treat or the germs are stronger.
2. The Reality Check (The "Overachiever" Problem):
The researchers compared what countries actually used (based on sales data from 67 countries) against what they should have used.
- Too Much "Watch": Almost 99% of the countries with data were using more "Watch" antibiotics than they needed. It's like using a sledgehammer to crack a nut when a regular hammer would do.
- Too Much Total Medicine: 72% of countries were using more total antibiotics than necessary.
- Too Little "Reserve": Many countries, especially in the middle-income groups, were using fewer "Reserve" antibiotics than they needed. This is dangerous; it means people with super-bugs might not be getting the "super-hero" medicine they desperately need to survive.
The "Why" Behind the Numbers
The researchers tried to use a complex math model to predict antibiotic use based on how many people were sick. However, the model didn't work well. It turned out that how sick a country's people are doesn't perfectly explain how much medicine they buy.
This suggests that culture, habits, and how doctors prescribe medicine play a huge role. Some countries might be over-prescribing "Watch" drugs because it's the habit, not because the patients need them. Others might not have enough "Access" drugs in their pharmacies, so patients go without.
The Takeaway
This paper provides the first-ever "ideal recipe" for how much antibiotic medicine every country should have.
- The Good News: The UN's goal of 70% "Access" drugs is scientifically sound.
- The Bad News: Most countries are currently using the wrong mix. They are overusing the "Watch" drugs (which risks creating super-bugs) and underusing the "Access" drugs (leaving people untreated) or the "Reserve" drugs (leaving the sickest people without help).
The study suggests that countries need to stop guessing and start benchmarking. By comparing themselves to the "Star Student" in their peer group, they can see if they are wasting medicine or not giving enough, and adjust their policies accordingly.
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