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Antibiotic Resistance

What is an antibiotic?
Antibiotic – drug used to prevent and treat bacterial infections.
How do Antibiotics work?
Bactericidal (kill bacteria)

Bacteriostatic (prevent bacteria from multiplying)

What is meant by antibiotic resistance?

− this occurs when bacteria change in a way that reduces the effectiveness of antibiotics used to combat infection. The bacteria survive and continue to multiply, worsening the course of infection.

Antibiotic resistance is the ability of bacteria to resist the effects of an antibiotic. It is one of the world’s most pressing public health problems as antibiotic-resistant bacteria can spread to close contacts and threaten the community. Antibiotic-resistant bacteria are often more difficult to kill and more expensive to treat. Overuse and misuse of antibiotics can promote the development of antibiotic-resistant bacteria. Repeated use of antibiotics kill sensitive bacteria but allow resistant bacteria to multiply resulting in an increase in the number of drug-resistant bacteria.

Bacteria can become resistant through several ways: 
–Neutralize an antibiotic by changing it in a way that makes it harmless
–Learn how to pump the antibiotic back outside of it before it can do any harm
–Change their outer structure so the antibiotic has no way to attach to the bacteria it is designed to kill
If even one bacterium becomes resistant to antibiotics, it can multiply and replace all the bacteria that were killed. Bacteria may also become resistant through mutation of their genetic material.

There are 4 core actions outlined by CDC with regards to fighting the spread of antibiotic resistance:
1. Preventing infections from occurring and preventing resistant bacteria from spreading
2. Tracking resistant bacteria
3. Improving the use of antibiotics
4. Promoting the development of new antibiotics and new diagnostic tests for resistant bacteria

According to WHO:
    Antibiotic resistance occurs naturally but misuse of antibiotics in humans and animals is accelerating the process. A growing number of infections such as pneumonia, tuberculosis and gonorrhoea are becoming harder to treat as the antibiotics used to treat them become less effective. This leads to longer hospital stays, higher medical costs and increased mortality (i.e death). The world urgently needs to change the way it prescribes and uses antibiotics. Even if new medicines are developed, without behaviour change, antibiotic resistance will remain a major threat. Behaviour changes must also include actions to reduce the spread of infections through vaccination, hand washing, practising safer sex, and good food hygiene. 
    Antibiotic resistance is rising to dangerously high levels in all parts of the world. New resistance mechanisms are emerging and spreading globally, threatening our ability to treat common infectious diseases. Where antibiotics can be bought for human or animal use without prescription, the emergence and spread of resistance is made worse. Without urgent action, we are heading for a post-antibiotic era, in which common infections and minor injuries can once again kill. When infections can no longer be treated by first-line antibiotics, more expensive medicines must be used. A longer duration of illness and treatment, often in hospitals, increases healthcare costs as well as the economic burden on families and societies.

No Evidence Stopping Antibiotics Early Increases Resistance...

According to a recently published article, no longer should patients be advised to complete the course of antibiotics as this is not backed by evidence. It is important to reduce antibiotic use to avoid an increase in antibiotic resistance. Goes against WHO recommendation of using antibiotics as prescribed. There is no evidence that stopping antibiotics early encourages antibiotic resistance. Using antibiotics longer than necessary increases the risk of antibiotic resistance.

Targeted selection 
–It is known that certain microorganisms causing infections can replicate in such a way that antibiotic-resistant mutations can occur if an inadequate dose of antibiotics are given or only one antibiotic is used. 
–This occurs with infections such as gonorrhoea, tuberculosis and malaria.

However, most bacteria do not develop resistance through targeted selection. Instead antibiotics affect harmless bodily flora, allowing opportunistic, resistant strains to replace them. This is called collateral selection. It is argued that the longer the opportunistic strains are exposed to antibiotics the greater the likelihood for resistance.

      It is understood that with some infections, such as otitis media, a shorter duration of treatment may not be as effective. Also there is a lower risk for further or resistant infection in some patients with pneumonia on shorter courses of treatment. Clinical trials are required to determine the recommended duration of antibiotic treatment. No clinical trials have found increased resistance with use of shorter course of antibiotics. Now recommended to disregard WHO’s advice and advise patients to stop treatment when they feel better. 
      Take home message...less is more.

      (Please note that this blog post is not intended for you to go against any medical advice given. It merely is meant to educate you with some information recently published.)

This post first appeared on Knowledge Is Power, please read the originial post: here

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Antibiotic Resistance


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