Top 10 Dangerous Antibiotic Resistant Bacteria
Antimicrobial resistance (AMR) is resistance of a microorganism to an antimicrobial drug that was originally effective for treatment of infections caused by it. Bacteria can become resistant to anti-bacterial agents, i.e. antibiotics, and in this setting the more specific term antibiotic resistance is used.
The bacteria listed below cover a range of diseases and levels of resistance. All of them present a threat to humans in some way or another. Some, like Tuberculosis for example, are already a huge challenge to overcome in their own right and will only become harder to control as their resistance to antibiotics grows.
Escherichia coli (E. coli)
First Documented: 1895
Illness Caused: Diarrhoea, Urinary Tract Infection, Meningitis
Antibiotic Resistance: High
Virulence: Worrying
Most E.coli is completely harmless and survives happily in the human digestive system. However, some strains of E.coli can cause serious illness and most commonly lead to severe food poisoning as well as meningitis and infections. A high level of resistance to antibiotics has been found across several strains of E.coli and while it is rare to find these strains causing illness, it is another concerning example of a bacteria that has the potential to cause problems if our use of antibiotics goes unchecked.
Acinetobacter baumannii
First Documented: 1911
Illness Caused: Pneumonia, Meningitis, Urinary Tract Infection
Antibiotic Resistance: High
Virulence: Worrying
Acinetobacter baumannii have become resistant to many antibiotics and like other bacteria are currently being countered most effectively through thorough hygiene in healthcare situations. The bacteria can survive in harsh conditions for long periods of time so are often difficult to deal with in weaker patients, and coupled with increasing resistance presents a tough challenge when encountered by doctors. Sometimes called Iraqibacter, Acinetobacter baumannii became very prevalent during the Iraq war amongst injured soldiers who passed through several different medical facilities.
Staphylococcus aureus (MRSA)
First Documented: 1884
Illness Caused: Pneumonia, Flesh Eating Disease
Antibiotic Resistance: Medium
Virulence: Dangerous
More commonly known as MRSA (which stands for Methicillin-resistant Staphylococcus aureus), this ‘superbug’ is very easily spread through human contact and can cause a range of illnesses from skin disorders to deadly diseases like meningitis and pneumonia. Most often treated with Penicillin type antibiotics, by 1960, 80 per cent of hospital samples were antibiotic resistant. A concerted effort in tracking the disease and improving hygiene measures in hospitals has seen cases of MRSA fall by 84.7 per cent in the UK between 2003 and 2011, proving that prevention is often the best form of defence against bacteria.
Mycobacterium tuberculosis
First Documented: 1882
Illness Caused: Tuberculosis
Antibiotic Resistance: Medium
Virulence: Deadly
Tuberculosis has been know by many names including scrofula and the White Plague and has been a huge cause of death and distraction throughout history, with evidence found in bodies estimated to be around 9,000 years old. It is believed that Nefertiti and her Pharaoh husband Akhenaten both died from tuberculosis in around 1330 BC, and documents remain from ancient Egypt that talk of the dangers of the disease. While instances of the disease reduced to only 5,000 a year in the UK in 1987, the increase in antibiotic resistance has seen a rise in cases in the early 90s.
Neisseria gonorrhoeae
First Documented: 1885
Illness Caused: Gonorrhoea
Antibiotic Resistance: Medium
Virulence: Worrying
Gonorrhoea is spread through sexual contact and causes various infections in both men and women. Certain strains of the bacteria have shown resistance to antibiotics and have mutated over the course of 50 years or so, slowly adapting different resistances as doctors change their approach by using different antibiotics to counter the disease. The small hairs or ‘pili’ on the bacteria act like hooks that are used to move the cell and attach it to other healthy cells. Using the pili the cell can exert a force 100,000 times its weight!
Klebsiella pneumoniae
First Documented: 1886
Illness Caused: Lung infections, Pneumonia
Antibiotic Resistance: Medium
Virulence: Worrying
Klebsiella pneumoniae can cause a range of infections and has proven to be very resistance to a range of antibiotics. Primarily affecting middle-aged and older men with weakened immune systems, this bacteria can be dangerous but is mostly ‘opportunistic’ and is far less likely to affect healthy adults. Due to its high levels of resistance, it is common in the US to perform tests to identify which strain is present in a patient to better inform doctors of how to treat them. This is slowing the rate at which resistance is built up but this bacteria is still of concern across the globe.
Pseudomonas aeruginosa
First Documented: 1872
Illness Caused: Pneumonia, Various Infections
Antibiotic Resistance: Medium
Virulence: Worrying
Quick to mutate and adapt to counter different antibiotic treatments, Pseudomonas aeruginosa shows an innate ability to develop resistance to antibiotics. Described as ‘opportunistic’ because it primarily affects humans that are already critically ill, this bacteria can cause serious complications in the treatment of AIDS, cancer or cystic fibrosis patients. While it isn’t a massive threat to humanity currently, this bacteria will become an increasing threat over the next few years.
Clostridium difficile
First Documented: 1935
Illness Caused: Diarrhoea
Antibiotic Resistance: Low
Virulence: Dangerous
One of the better known ‘superbugs’ because of a consistent presence in hospitals around the world, C. difficile is, primarily, an easily spread type of diarrhoea that can lead to complications in the colon. Several significant outbreaks of C. difficile have made the news in the UK and despite a major effort in improving hygiene in hospitals, the bacteria is responsible for a significant number of deaths globally. The chance of catching C. Difficile is actually increased by exposure to antibiotics – you are more likely to get ill from C. difficile if your internal balance has been upset and the bacteria can exploit this.
Streptococcus pyogenes
First Documented: 1884
Illness Caused: Sore Throat, Skin disorders
Antibiotic Resistance: Low
Virulence: Deadly
Like other potentially dangerous bacteria such as E.coli, Streptococcus pyogenes can be found in 5 per cent – 15 per cent of all humans, residing in the lungs or throat without causing any harm. Streptococcus pyogenes causes over 700 million infections globally every year and has a high mortality rate of 25 per cent in serious cases – once you have an infection the bacteria can cause a range of diseases ranging from sore throat and impetigo up to scarlet fever. Luckily, the bacteria is affected by penicillin so is treated easily in most cases – however several strains are building resistance to various other antibiotics.
Burkholderia cepacia
First Documented: 1949
Illness Caused: Pneumonia
Antibiotic Resistance: Low
Virulence: Worrying
Discovered in 1949 as the bacterium that causes onions to rot, Burkholderia cepacia can be very dangerous to humans in the worst cases. While it mostly responds well to treatment with a combination of antibiotics, it has been shown to have high levels of resistance to several types of antibiotics and is able to survive in extreme conditions. Particularly dangerous to humans with preexisting lung conditions such as Cystic Fibrosis, scientists have been developing new ways to fight the bacteria as it evolves an increasing resistance to antibiotics.
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