Acinetobacter baumannii

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Acinetobacter baumannii
A.baumannii visualized using Scanning electron microscopy.png
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Bacteria
Phylum: Pseudomonadota
Class: Gammaproteobacteria
Order: Pseudomonadales
Family: Moraxellaceae
Genus: Acinetobacter
Species:
A. baumannii
Binomial name
Acinetobacter baumannii
Bouvet and Grimont 1986 [1]

Acinetobacter baumannii is a typically short, almost round, rod-shaped (coccobacillus) Gram-negative bacterium. It is named after the bacteriologist Paul Baumann. [2] It can be an opportunistic pathogen in humans, affecting people with compromised immune systems, and is becoming increasingly important as a hospital-derived (nosocomial) infection. While other species of the genus Acinetobacter are often found in soil samples (leading to the common misconception that A. baumannii is a soil organism, too), it is almost exclusively isolated from hospital environments. [3] Although occasionally it has been found in environmental soil and water samples, [4] its natural habitat is still not known.[ citation needed ]

Contents

Bacteria of this genus lack flagella but exhibit twitching or swarming motility, likely mediated by type IV pili. Motility in A. baumannii may also be due to the excretion of exopolysaccharide, creating a film of high-molecular-weight sugar chains behind the bacterium to move forward. [5] Clinical microbiologists typically differentiate members of the genus Acinetobacter from other Moraxellaceae by performing an oxidase test, as Acinetobacter spp. are the only members of the Moraxellaceae to lack cytochrome c oxidases. [6]

A. baumannii is part of the ACB complex (A. baumannii, A. calcoaceticus , and Acinetobacter genomic species 13TU). It is difficult to determine the specific species of members of the ACB complex and they comprise the most clinically relevant members of the genus. [7] [8] A. baumannii has also been identified as an ESKAPE pathogen ( Enterococcus faecium , Staphylococcus aureus , Klebsiella pneumoniae , Acinetobacter baumannii, Pseudomonas aeruginosa , and Enterobacter species), a group of pathogens with a high rate of antibiotic resistance that are responsible for the majority of nosocomial infections. [9]

Colloquially, A. baumannii is referred to as "Iraqibacter" due to its seemingly sudden emergence in military treatment facilities during the Iraq War. [10] It has continued to be an issue for veterans and soldiers who served in Iraq and Afghanistan. Multidrug-resistant A. baumannii has spread to civilian hospitals in part due to the transport of infected soldiers through multiple medical facilities. [5] During the COVID-19 pandemic, coinfection with A. baumannii secondary to SARS-CoV-2 infections has been reported multiple times in medical publications. [11]

OmpA

Adhesion can be a critical determinant of virulence for bacteria. The ability to attach to host cells allows bacteria to interact with them in various ways, whether by type III secretion system or simply by holding on against the prevailing movement of fluids. Outer membrane protein A (OmpA) has been shown to be involved in the adherence of A. baumannii to epithelial cells. This allows the bacteria to invade the cells through the zipper mechanism. [12] The protein was also shown to localize to the mitochondria of epithelial cells. [13] OmpA attachment to mitochondria induces it leading to swelling of mitochondria. This releases cytochrome c, which causes formation of apoptosome. This leads to the apoptosis of the cell. [14]

Antibiotic resistance

Mechanisms of antibiotic resistance can be categorized into three groups. First, resistance can be achieved by reducing membrane permeability or increasing efflux of the antibiotic and thus preventing access to the target. Second, bacteria can protect the antibiotic target through genetic mutation or post-translational modification, and last, antibiotics can be directly inactivated by hydrolysis or modification. One of the most important weapons in the armoury of Acinetobacter is its impressive genetic plasticity, facilitating rapid genetic mutations and rearrangements as well as integration of foreign determinants carried by mobile genetic elements. Of these, insertion sequences are considered one of the key forces shaping bacterial genomes and ultimately evolution. [11]

AbaR resistance islands

Pathogenicity islands, relatively common genetic structures in bacterial pathogens, are composed of two or more adjacent genes that increase a pathogen's virulence. They may contain genes that encode toxins, coagulate blood, or as in this case, allow the bacteria to resist antibiotics. AbaR-type resistance islands are typical of drug-resistant A. baumannii, and different variations may be present in a given strain. Each consists of a transposon backbone of about 16.3 Kb that facilitates horizontal gene transfer. This makes horizontal gene transfer of this and similar pathogenicity islands more likely because, when genetic material is taken up by a new bacterium, the transposons allow the pathogenicity island to integrate into the new microorganism's genome. In this case, it would grant the new microorganism the potential to resist certain antibiotics. Antibiotic resistance genes are commonly transferred between Gram-negative bacteria through plasmids via conjugation, which accelerates the appearance of new resistant strains. AbaR's contain several genes for antibiotic resistance, all flanked by insertion sequences. There exist several resistance genes circulating along A. baumannii that can be clustered in replicon groups, and may be transferred from the extensively drug-resistant Acinetobacter baumannii (XDR- AB) and New Delhi Metallo-beta-lactamase-1-producing Acinetobacter baumannii (NDM- AB) to environmental isolates of Acinetobacter spp. Conjugation experiments demonstrated that the blaOXA-23, blaPER-1, and aphA6 genes could be successfully transferred between the clinical and the environmental isolates via the plasmid group GR6 or class 1 integrons through in vitro conjugation. [15] In collaboration with some other genes, they provide resistance to aminoglycosides, aminocyclitols, tetracycline, and chloramphenicol. [16] [17]

Efflux pumps

Efflux pumps are protein machines that use energy to pump antibiotics and other small molecules that get into the bacterial cytoplasm and the periplasmic space out of the cell. By constantly pumping antibiotics out of the cell, bacteria can increase the concentration of a given antibiotic required to kill them or inhibit their growth when the target of the antibiotic is inside the bacterium. A. baumannii is known to have two major efflux pumps which decrease its susceptibility to antimicrobials. The first, AdeB, has been shown to be responsible for aminoglycoside resistance. [18] The second, AdeDE, is responsible for efflux of a wide range of substrates, including tetracycline, chloramphenicol, and various carbapenems. [19] Many other efflux pumps have been implicated in A. baumannii resistant strains. [11]

Small RNA

Bacterial small RNAs are noncoding RNAs that regulate various cellular processes. Three sRNAs, AbsR11, AbsR25, and AbsR28, have been experimentally validated in the MTCC 1425 (ATCC15308) strain, which is a (multidrug-resistant) strain showing resistance to 12 antibiotics. AbsR25 sRNA could play a role in the efflux pump regulation and drug resistance. [20]

Beta-lactamase

A. baumannii has been shown to produce at least one beta-lactamase, which is an enzyme responsible for cleaving the four-atom lactam ring typical of beta-lactam antibiotics. Beta-lactam antibiotics are structurally related to penicillin, which inhibits synthesis of the bacterial cell wall. The cleaving of the lactam ring renders these antibiotics harmless to the bacteria. A. baumannii have been observed to express beta-lactamases known as Acinetobacter-derived cephalosporinases (ADCs), which are class C beta-lactamases. [21] In addition, the beta-lactamase OXA-51, a class D beta-lactamase, has been observed in A. baumannii, found to be flanked by insertion sequences, suggesting it was acquired by horizontal gene transfer. [22]

Biofilm formation

A. baumannii has been noted for its apparent ability to survive on artificial surfaces for an extended period of time, therefore allowing it to persist in the hospital environment. This is thought to be due to its ability to form biofilms. [23] For many biofilm-forming bacteria, the process is mediated by flagella. However, for A. baumannii, this process seems to be mediated by pili. Further, disruption of the putative pili chaperone and usher genes csuC and csuE were shown to inhibit biofilm formation. [24] The formation of biofilms has been shown to alter the metabolism of microorganisms within the biofilm, consequently reducing their sensitivity to antibiotics. This may be because fewer nutrients are available deeper within the biofilm. A slower metabolism can prevent the bacteria from taking up an antibiotic or performing a vital function fast enough for particular antibiotics to have an effect. They also provide a physical barrier against larger molecules and may prevent desiccation of the bacteria. [4] [25] In general, biofilm formation has been linked so far with BfmRS TCS (two-component system) regulating Csu pili, Csu expression regulated by the GacSA TCS, biofilm-associated proteins BapAb, synthesis of the exopolysaccharide poly-β-1,6-N-acetylglucosamine PNAG, acyl-homoserine lactones through AbaR receptor, and AbaI autoinducer synthase. Moreover, inactivation of adeRS operon negatively affects biofilm formation and prompts decreased expression of AdeABC. Disruption of abaF has displayed an increase in fosfomycin susceptibility and a decrease in biofilm formation and virulence, suggesting a major role for this pump. [11]

The formation of biofilm involves cell attachment, a fundamental process typically triggered by environmental metabolites. A. baumannii is able to use vanillic acid as its sole carbon source, like its close relative A. baylyi. This metabolic pathway is regulated by transcriptional repressor VanR. When vanillic acid enters the cell through VanP and VanK porins it binds to the VanR regulator, which is usually bound to PvanABKP and Pcsu promoters. This binding ables the repression of PvanABKP and Pcsu promoters, which leads to increased expression of VanP and VanK porins in the cell membrane and increased expression of Csu pili. The increased expression of Csu pili results a high biofilm formation phenotype of A. baumannii. [26]

Signs and symptoms of infection

A. baumannii is an opportunistic pathogen with a range of different diseases, each with their own symptoms. Some possible types of A. baumannii infections include:[ citation needed ]

Symptoms of A. baumannii infections are often indistinguishable from other opportunistic infections caused by other opportunistic bacteria - including Klebsiella pneumoniae and Streptococcus pneumoniae .[ citation needed ]

Symptoms of A. baumannii infections in turn range from fevers and chills, rash, confusion and/or altered mental states, pain or burning sensations when urinating, strong urge to urinate frequently, sensitivity to bright light, nausea (with or without vomiting), muscle and chest pains, breathing problems, and cough (with or without yellow, green, or bloody mucus). [27] In some cases, A. baumannii may present no infection or symptoms, as with colonizing an open wound or tracheostomy site. [28]

Treatment

When infections are caused by antibiotic-susceptible Acinetobacter isolates, there may be several therapeutic options, including a broad-spectrum cephalosporin (ceftazidime or cefepime), a combination beta-lactam/beta-lactamase inhibitor (i.e., one that includes sulbactam), or a carbapenem (e.g., imipenem or meropenem). Because most infections are now resistant to multiple drugs, determining what susceptibilities the particular strain has is necessary for treatment to be successful. Traditionally, infections were treated with imipenem or meropenem, but a steady rise in carbapenem-resistant A. baumannii has been noted. [29] Consequently, treatment methods often fall back on polymyxins, particularly colistin although tetracyclines have shown promise in MDR A. baumannii. [30] [31] Colistin is considered a drug of last resort because it often causes kidney damage, among other side effects. [32] Prevention methods in hospitals focus on increased hand-washing and more diligent sterilization procedures. [33] An A. baumannii infection was recently treated using phage therapy. [34] Phages are viruses that attack bacteria, [35] and have also been demonstrated to resensitize A. baumannii to antibiotics it normally resists. [36]

Traumatic injuries, like those from improvised explosive devices, leave large open areas contaminated with debris that are vulnerable to becoming infected with A. baumannii. Flickr - The U.S. Army - Soldiers receive treatment for IED injuries.jpg
Traumatic injuries, like those from improvised explosive devices, leave large open areas contaminated with debris that are vulnerable to becoming infected with A. baumannii.
The logistics of transporting wounded soldiers result in patients visiting several facilities where they may acquire A. baumannii infections. CASEVAC flowchart.jpg
The logistics of transporting wounded soldiers result in patients visiting several facilities where they may acquire A. baumannii infections.

Scientists at MIT, Harvard's Broad Institute and MIT's CSAIL found a compound named halicin using deep learning that can effectively kill A. baumannii. The compound is a repurposed drug. [37] [38] The candidate drug abaucin has narrow-spectrum effectiveness.[ citation needed ] Zosurabalpin kills A. baumannii, is effective in animal models, and is currently in Phase I clinical trials. [39] [40]

Occurrence in veterans injured in Iraq and Afghanistan

American and other western soldiers in Iraq and Afghanistan were at risk of traumatic injury due to gunfire and improvised explosive devices. Previously, infection was thought to occur due to contamination with A. baumannii at the time of injury. Subsequent studies showed that although A. baumannii may be infrequently isolated from the natural environment, the infection was more likely nosocomially acquired, likely due to the ability of A. baumannii to persist on artificial surfaces for extended periods, and the several facilities to which injured soldiers were exposed during the casualty-evacuation process. Injured soldiers were first taken to level-I facilities, where they were stabilized. Depending on the severity of the injury, the soldiers might then be transferred to a level-II facility, which consists of a forward surgical team, for additional stabilization. Depending on the logistics of the locality, the injured soldiers might be transfer between these facilities several times before finally being taken to a major hospital within the combat zone (level III). Generally after 1–3 days, when the patients were stabilized, they were transferred by air to a regional facility (level IV) for additional treatment. For soldiers serving in Iraq or Afghanistan, this was typically Landstuhl Regional Medical Center in Germany. Finally, the injured soldiers were transferred to hospitals in their home country for rehabilitation and additional treatment. [41] This repeated exposure to many different medical environments seems to be the reason A. baumannii infections have become increasingly common. Multidrug-resistant A. baumannii is a major factor in complicating the treatment and rehabilitation of injured soldiers, and has led to additional deaths. [7] [42] [43]

Incidence in hospitals

Being referred to as an opportunistic infection, A. baumannii infections are highly prevalent in hospital settings. A. baumannii poses very little risk to healthy individuals; [44] however, factors that increase the risks for infection include:

A. baumannii can be spread through direct contact with surfaces, objects, and the skin of contaminated persons. [27]

The importation of A. baumannii and subsequent presence in hospitals has been well documented. [45] A. baumannii is usually introduced into a hospital by a colonized patient. Due to its ability to survive on artificial surfaces and resist desiccation, it can remain and possibly infect new patients for some time. A baumannii growth is suspected to be favored in hospital settings due to the constant use of antibiotics by patients in the hospital. [46] Acinetobacter can be spread by person-to-person contact or contact with contaminated surfaces. [47] Acinetobacter can enter through open wounds, catheters and breathing tubes. [48] In a study of European intensive care units in 2009, A. baumannii was found to be responsible for 19.1% of ventilator-associated pneumonia cases. [49]

Documented case studies
CountryReference
Australia [50] [51]
Brazil [52] [53] [54] [55]
China [56] [57] [58] [59]
Germany [60] [61] [62]
India [63] [64] [65]
South Korea [66] [67] [68] [69]
United Kingdom [70] [71]
United States [72] [73] [74] [75]

Related Research Articles

<span class="mw-page-title-main">Beta-lactamase</span> Class of enzymes

Beta-lactamases (β-lactamases) are enzymes produced by bacteria that provide multi-resistance to beta-lactam antibiotics such as penicillins, cephalosporins, cephamycins, monobactams and carbapenems (ertapenem), although carbapenems are relatively resistant to beta-lactamase. Beta-lactamase provides antibiotic resistance by breaking the antibiotics' structure. These antibiotics all have a common element in their molecular structure: a four-atom ring known as a beta-lactam (β-lactam) ring. Through hydrolysis, the enzyme lactamase breaks the β-lactam ring open, deactivating the molecule's antibacterial properties.

<span class="mw-page-title-main">Drug resistance</span> Pathogen resistance to medications

Drug resistance is the reduction in effectiveness of a medication such as an antimicrobial or an antineoplastic in treating a disease or condition. The term is used in the context of resistance that pathogens or cancers have "acquired", that is, resistance has evolved. Antimicrobial resistance and antineoplastic resistance challenge clinical care and drive research. When an organism is resistant to more than one drug, it is said to be multidrug-resistant.

<i>Klebsiella pneumoniae</i> Species of bacterium

Klebsiella pneumoniae is a Gram-negative, non-motile, encapsulated, lactose-fermenting, facultative anaerobic, rod-shaped bacterium. It appears as a mucoid lactose fermenter on MacConkey agar.

<i>Acinetobacter</i> Genus of bacteria

Acinetobacter is a genus of Gram-negative bacteria belonging to the wider class of Gammaproteobacteria. Acinetobacter species are oxidase-negative, exhibit twitching motility, and occur in pairs under magnification.

<span class="mw-page-title-main">Colistin</span> Antibiotic

Colistin, also known as polymyxin E, is an antibiotic medication used as a last-resort treatment for multidrug-resistant Gram-negative infections including pneumonia. These may involve bacteria such as Pseudomonas aeruginosa, Klebsiella pneumoniae, or Acinetobacter. It comes in two forms: colistimethate sodium can be injected into a vein, injected into a muscle, or inhaled, and colistin sulfate is mainly applied to the skin or taken by mouth. Colistimethate sodium is a prodrug; it is produced by the reaction of colistin with formaldehyde and sodium bisulfite, which leads to the addition of a sulfomethyl group to the primary amines of colistin. Colistimethate sodium is less toxic than colistin when administered parenterally. In aqueous solutions, it undergoes hydrolysis to form a complex mixture of partially sulfomethylated derivatives, as well as colistin. Resistance to colistin began to appear as of 2015.

<span class="mw-page-title-main">Meropenem</span> Broad-spectrum antibiotic

Meropenem, sold under the brand name Merrem among others, is an intravenous carbapenem antibiotic used to treat a variety of bacterial infections. Some of these include meningitis, intra-abdominal infection, pneumonia, sepsis, and anthrax.

Multiple drug resistance (MDR), multidrug resistance or multiresistance is antimicrobial resistance shown by a species of microorganism to at least one antimicrobial drug in three or more antimicrobial categories. Antimicrobial categories are classifications of antimicrobial agents based on their mode of action and specific to target organisms. The MDR types most threatening to public health are MDR bacteria that resist multiple antibiotics; other types include MDR viruses, parasites.

<i>Pseudomonas aeruginosa</i> Species of bacterium

Pseudomonas aeruginosa is a common encapsulated, Gram-negative, aerobic–facultatively anaerobic, rod-shaped bacterium that can cause disease in plants and animals, including humans. A species of considerable medical importance, P. aeruginosa is a multidrug resistant pathogen recognized for its ubiquity, its intrinsically advanced antibiotic resistance mechanisms, and its association with serious illnesses – hospital-acquired infections such as ventilator-associated pneumonia and various sepsis syndromes. P. aeruginosa is able to selectively inhibit various antibiotics from penetrating its outer membrane - and has high resistance to several antibiotics. According to the World Health Organization P. aeruginosa poses one of the greatest threats to humans in terms of antibiotic resistance.

<span class="mw-page-title-main">Carbapenem</span> Class of highly effective antibiotic agents

Carbapenems are a class of very effective antibiotic agents most commonly used for treatment of severe bacterial infections. This class of antibiotics is usually reserved for known or suspected multidrug-resistant (MDR) bacterial infections. Similar to penicillins and cephalosporins, carbapenems are members of the beta-lactam antibiotics drug class, which kill bacteria by binding to penicillin-binding proteins, thus inhibiting bacterial cell wall synthesis. However, these agents individually exhibit a broader spectrum of activity compared to most cephalosporins and penicillins. Furthermore, carbapenems are typically unaffected by emerging antibiotic resistance, even to other beta-lactams.

<span class="mw-page-title-main">Imipenem</span> Carbapenem antibiotic

Imipenem is a synthetic β-lactam antibiotic belonging to the carbapenems chemical class. developed by Merck scientists Burton Christensen, William Leanza, and Kenneth Wildonger in the mid-1970s. Carbapenems are highly resistant to the β-lactamase enzymes produced by many multiple drug-resistant Gram-negative bacteria, thus playing a key role in the treatment of infections not readily treated with other antibiotics. It is usually administered through intravenous injection.

β-Lactamase inhibitor Drugs that inhibit β-Lactamase enzymes

Beta-lactamases are a family of enzymes involved in bacterial resistance to beta-lactam antibiotics. In bacterial resistance to beta-lactam antibiotics, the bacteria have beta-lactamase which degrade the beta-lactam rings, rendering the antibiotic ineffective. However, with beta-lactamase inhibitors, these enzymes on the bacteria are inhibited, thus allowing the antibiotic to take effect. Strategies for combating this form of resistance have included the development of new beta-lactam antibiotics that are more resistant to cleavage and the development of the class of enzyme inhibitors called beta-lactamase inhibitors. Although β-lactamase inhibitors have little antibiotic activity of their own, they prevent bacterial degradation of beta-lactam antibiotics and thus extend the range of bacteria the drugs are effective against.

<span class="mw-page-title-main">New Delhi metallo-beta-lactamase 1</span> Enzyme

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<span class="mw-page-title-main">Plasmid-mediated resistance</span> Antibiotic resistance caused by a plasmid

Plasmid-mediated resistance is the transfer of antibiotic resistance genes which are carried on plasmids. Plasmids possess mechanisms that ensure their independent replication as well as those that regulate their replication number and guarantee stable inheritance during cell division. By the conjugation process, they can stimulate lateral transfer between bacteria from various genera and kingdoms. Numerous plasmids contain addiction-inducing systems that are typically based on toxin-antitoxin factors and capable of killing daughter cells that don't inherit the plasmid during cell division. Plasmids often carry multiple antibiotic resistance genes, contributing to the spread of multidrug-resistance (MDR). Antibiotic resistance mediated by MDR plasmids severely limits the treatment options for the infections caused by Gram-negative bacteria, especially family Enterobacteriaceae. The global spread of MDR plasmids has been enhanced by selective pressure from antimicrobial medications used in medical facilities and when raising animals for food.

Multidrug resistant Gram-negative bacteria are a type of Gram-negative bacteria with resistance to multiple antibiotics. They can cause bacteria infections that pose a serious and rapidly emerging threat for hospitalized patients and especially patients in intensive care units. Infections caused by MDR strains are correlated with increased morbidity, mortality, and prolonged hospitalization. Thus, not only do these bacteria pose a threat to global public health, but also create a significant burden to healthcare systems.

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ESKAPE is an acronym comprising the scientific names of six highly virulent and antibiotic resistant bacterial pathogens including: Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter spp. The acronym is sometimes extended to ESKAPEE to include Escherichia coli. This group of Gram-positive and Gram-negative bacteria can evade or 'escape' commonly used antibiotics due to their increasing multi-drug resistance (MDR). As a result, throughout the world, they are the major cause of life-threatening nosocomial or hospital-acquired infections in immunocompromised and critically ill patients who are most at risk. P. aeruginosa and S. aureus are some of the most ubiquitous pathogens in biofilms found in healthcare. P. aeruginosa is a Gram-negative, rod-shaped bacterium, commonly found in the gut flora, soil, and water that can be spread directly or indirectly to patients in healthcare settings. The pathogen can also be spread in other locations through contamination, including surfaces, equipment, and hands. The opportunistic pathogen can cause hospitalized patients to have infections in the lungs, blood, urinary tract, and in other body regions after surgery. S. aureus is a Gram-positive, cocci-shaped bacterium, residing in the environment and on the skin and nose of many healthy individuals. The bacterium can cause skin and bone infections, pneumonia, and other types of potentially serious infections if it enters the body. S. aureus has also gained resistance to many antibiotic treatments, making healing difficult. Because of natural and unnatural selective pressures and factors, antibiotic resistance in bacteria usually emerges through genetic mutation or acquires antibiotic-resistant genes (ARGs) through horizontal gene transfer - a genetic exchange process by which antibiotic resistance can spread.

<span class="mw-page-title-main">Cefiderocol</span> Antibiotic

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<span class="mw-page-title-main">Multidrug-resistant bacteria</span>

Multidrug-resistant bacteria are bacteria that are resistant to three or more classes of antimicrobial drugs. MDR bacteria have seen an increase in prevalence in recent years and pose serious risks to public health. MDR bacteria can be broken into 3 main categories: Gram-positive, Gram-negative, and other (acid-stain). These bacteria employ various adaptations to avoid or mitigate the damage done by antimicrobials. With increased access to modern medicine there has been a sharp increase in the amount of antibiotics consumed. Given the abundant use of antibiotics there has been a considerable increase in the evolution of antimicrobial resistance factors, now outpacing the development of new antibiotics.

<span class="mw-page-title-main">Sulbactam/durlobactam</span> Combination medication

Sulbactam/durlobactam, sold under the brand name Xacduro, is a co-packaged medication used for the treatment of bacterial pneumonia caused by Acinetobacter baumannii-calcoaceticus complex. It contains sulbactam, a beta-lactam antibacterial and beta-lactamase inhibitor; and durlobactam, a beta-lactamase inhibitor.

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