Home

E coli shape

E-shape - Preise für E-shap

  1. Jetzt E-shape Angebote durchstöbern & online kaufen
  2. Super-Angebote für Escheria Coli hier im Preisvergleich bei Preis.de! Escheria Coli zum kleinen Preis. In geprüften Shops bestellen
  3. ing the rod shape. To a good approximation, the E. colicell has hemispherical caps and a cylindrical section in between
  4. Biology Of E. Coli E. coli (Escherichia coli) are a small, Gram-negative species of bacteria. Most strains of E. coli are rod-shaped and measure about 2.0 μm long and 0.2-1.0 μm in diameter. They typically have a cell volume of 0.6-0.7 μm, most of which is filled by the cytoplasm
  5. e cell shape, the extent of.
  6. Escherichia coli, often abbreviated E. coli, are rod-shaped bacteria that tend to occur individually and in large clumps. E. coli are classified as facultative anaerobes, which means that they grow best when oxygen is present but are able to switch to non-oxygen-dependent chemical processes in the absence of oxygen

Escherichia coli (/ ˌɛʃəˈrɪkiə ˈkoʊlaɪ /), also known as E. coli (/ ˌiː ˈkoʊlaɪ /), is a Gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms (endotherms) E. coli Shape (form): circular Margin: entire Elevation: raised Size: punctiform, small Texture (surface): smooth Appearance: shiny Pigmentation: nonpigmented (colorless) Optical property: translucent S. aureus Shape (form): circular Margin: entire Elevation: convex Size: moderate, large Texture (surface): rough Appearance: shiny Pigmentation: tan, golden yellow Optical property: opaque For. MORPHOLOGY OF ESCHERICHIA COLI (E. COLI) Shape - Escherichia coli is a straight, rod shape (bacillus) bacterium. Size - The size of Escherichia coli is about 1-3 µm × 0.4-0.7 µm (micrometer). Arrangement Of Cells - Escherichia coli is arranged singly or in pairs Colorized scanning electron micrograph of Escherichia coli, grown in culture and adhered to a cover slip (Image courtesy of the NIH) Bacteria come in all shapes and sizes — some are straight as a rod, others twist like a corkscrew. Shape plays an important role in how bacteria infiltrate and attack cells in the body

Microbiology

Escherichia coli. Four different strains of Escherichia coli on Endo agar with biochemical slope . Glucose fermentation with gas production, urea and H 2 S negative, lactose positive (with exception of strain D - late lactose fermenter; on Endo agar it looks like lactose negative).All four strains are mannitol positive (best seen in fig. D), cellobiose negative (strains A, B) During stationary phase, E. coli transform to a more spherical shape (19). Wild-type E. coli in micron-scale agarose moldings grow in a variety of cell shapes determined by their confinement, and the new cell shape persists after the bacteria are released (20) Ultrasmall Bacteria. Ultrasmall bacteria (150 could fit in a single Escherichia coli) have been discovered in groundwater that was passed through a filter with a pore size of 0.2 micrometers µm). They showed an average length of only 323 nanometers (nm) and an average width of 242 nm. They contain DNA, an average of 42 ribosomes per bacterium, and possessed pili Bacteria Escherichia coli: Reference: Zaritsky A, Woldringh CL. Chromosome replication rate and cell shape in Escherichia coli: lack of coupling. J Bacteriol. 1978 Aug135(2):581-7 p.583 table 1 PubMed ID 355235: Method: Coulter counter or Electron microscopy. Grown on glucose and casaminoacids E. Coli under the Microscope Types, Techniques, Gram Stain and Hanging Drop Method Introduction (E. Coli) Commonly referred to as E. coli, Escherichia coli is a bacterium that is typically found in a number of environments including various foods, soil and animal intestines. E. coli is very diverse and belongs to the genus Escherichia

Scientists Turn Bacteria Into DNA Tape Recorders | IFLScience

Escheria Coli Preise - Jetzt Preise vergleiche

E. coli is a facultative (aerobic and anaerobic growth) gram-negative, rod shaped bacteria that can be commonly found in animal feces, lower intestines of mammals, and even on the edge of hot springs. They grow best at 37 C. E. coli is a Gram-negative organism that can not sporulate Escherichia coli is a member of the family Enterobacteriaceae, which includes gram-negative, facultatively anaerobic rod-shaped bacteria (possessing both a fermentative and respiratory metabolism) and which do not produce the enzyme oxidase. Escherichia coli cells are typically 1.1-1.5-μm-wide, 2-6-μm-long and occur as single straight rods E. Coli are rod-shaped anaerobic gram-negative bacterium, allowing them to be categorized under enterobacterials (Order). E. Coli move with peritrichous flagella allowing them to be categorized under Enterbacteriaceae (Family). E. Coli mainly colonize and spread in the intestines of mammal, making them Genus Escherichia (Genus) Escherichia coli (abbreviated as E. coli) are bacteria found in the environment, foods, and intestines of people and animals.E. coli are a large and diverse group of bacteria. Although most strains of E. coli are harmless, others can make you sick. Some kinds of E. coli can cause diarrhea, while others cause urinary tract infections, respiratory illness and pneumonia, and other illnesses

Escherichia coli are typically Gram-negative, rod shaped (2.0-6.0 μm in length and 1.1-1.5 μm wide bacilli) bacteria with rounded ends. The actual shape of these bacteria does, however, vary from spherical (cocci) cells through to elongated or filamentous rods Escherichia coli, often abbreviated E. coli, are rod-shaped bacteria that tend to occur individually and in large clumps. E. coli bacteria have a single cell arrangement, according to Schenectady County Community College. E. coli is a gram-negativ..

E. coli is a rod-shaped bacteria. What is E. coli? Escherichia coli (E. coli) is a bacteria that normally lives in the intestines of both healthy people and animals. In most cases, this bacteria is harmless Escherichia coli is a bacterium that normally lives in the intestines of humans and other animals. Most types of E. coli are harmless, but some can cause disease. Disease-causing E. coli are grouped according to the different ways by which they cause illness. Enterotoxigenic Escherichia coli, or ETEC, is the name given to a group of E. coli that produce special toxins which stimulate the. E. coli strains that cause UTIs are termed uropathogenic E. coli (UPEC). In general, UPEC strains differ from commensal E. coli strains in that the former possess extragenetic material, often on pathogenicity-associated islands (PAIs), which code for gene products that may contribute to bacterial pathogenesis Escherichia Coli is a Common Intestinal Bacteria. E. coli is a Gram negative anaerobic, rod-shaped, coliform bacteria of the genus Escherichia, commonly found in the lower intestine of humans and animals.. Most varieties are harmless. Some cause brief diarrhea. There are, however, a few serious strains such as E. coli O157:H7, which results in severe abdominal cramps, vomiting, and bloody.

Cell Shape Dynamics in Escherichia col

◦ Bacteria: E. coli  Must observe under 400x  Very small & motile  Looks like specks of sand  Hard to discern shape  Smaller than yeast & protozoa  Instructor to provide demonstration & instruction Escherichia coli (or simply E. coli) is one of the many groups of bacteria that live in the intestines of healthy humans and most warm-blooded animals. E. coli bacteria help maintain the balance of normal intestinal flora (bacteria) against harmful bacteria and synthesize or produce some vitamins The E. coli are the same shape as the possible fossils in slide #26, but are 10 to 100 times as big. This difference in size translates to a huge difference in volume — the possible martian microfossils have only one thousandth to one millionth of the volume of E. coli cells A rule of thumb based upon generations of light and electron microscopy measurements for the dimensions of an E. coli cell is to assign it a diameter of about ≈1µm, a length of ≈2µm, and a volume of ≈1µm 3 (1 fL) (BNID 101788). The shape can be approximated as a spherocylinder, i.e. a cylinder with hemispherical caps One Escherichia coli (E. coli) strain that causes a severe intestinal infection in humans is known as enterohemorrhagic E. coli (EHEC). It's the most common strain to cause illness in people. It's different from other E. coli because it produces a potent toxin called Shiga toxin. This toxin damages the lining of the intestinal wall, causing bloody diarrhea

E. Coli: Gram Stain, Shape And Size Science Trend

Ribosomi

that had been purified from the E. coli B/r strain used by Patrick and Lee (3) and stored lyophilized in sealed, evacuated ampoules. The glutamine synthetase, used as a size and shape reference, was a gift from Dr. E. Heidner, UCLA Biological Structure Laboratory The E. coli O157:H7 strain belongs to a group of E. coli that produces a powerful toxin that damages the lining of the small intestine. This can cause bloody diarrhea. You develop an E. coli infection when you ingest this strain of bacteria. Unlike many other disease-causing bacteria, E. coli can cause an infection even if you ingest only small. elongation, division, and shape of cells of bacteria. Individual cells of E. coli are rod-shaped and are ap-proximately 800 nm wide and 2.5 ím long. Filamentous cells of E. coli are long, multi-nucleoid, and form when normal cells elongate and replicate their DNA, but do not septate and divide.1 These elongated cells act as if they wer

E. coli shape up Nature Reviews Microbiolog

What Is the Shape and Arrangement of Escherichia Coli

Serratia liquefaciens - microbewiki

CHARACTERISTICS: Enteropathogenic Escherichia coli (EPEC) are in the family Enterobacteriaceae. Footnote. 2. The bacteria are gram negative, rod shaped, non-spore forming, motile with peritrichous flagella or nonmotile, and grow on MacConkey agar (colonies are 2 to 3 mm in diameter and red or colorless) Footnote. 5 E. coli (Escherichia coli), is a type of bacteria that normally lives in your intestines.It's also found in the gut of some animals. Most types of E. coli are harmless and even help keep your. Escherichia coli is the most-studied microorganism. It is both a common commensal inhabitant of the gastrointestinal tract and one of the most important pathogens in humans. Thus, the most frequent cause of bloodstream infection and urinary tract infections (UTIs) among Gram-negative bacteria (GNB) is E. coli CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): This paper describes a technique for growing filamentous cells of Escherichia coli with defined shapes, including crescents, zigzags, sinusoids, and spirals. The procedure begins with the fabrication of embossed microchambers in agarose. Cells are trapped in the chambers by placing a flat, flexible ceiling.

Escherichia coli O157:H7 was first recognized as a pathogen in 1982 during an outbreak investigation of hemorrhagic colitis (). E. coli O157 infection can lead to hemolytic uremic syndrome (HUS), characterized by hemolytic anemia, thrombocytopenia, and renal injury ().Still, it was not until 1993, after a large multistate E. coli O157 outbreak linked to undercooked ground beef patties sold. shape regulation in E. coli. Cell shape, which in many types of bacteria is determined by a mechanically rigid peptidoglycan (PG) cell wall, is crucial for bacterial motility, proliferation, adhesion, and survival.1, 2, 3 Rod-like bacteria maintain their shapes at a fixed diameter with extraordinar From left to right, the germ pops represent: MRSA, Influenza, Chicken Pox, E.Coli, and HIV. Wei Li I think design is not only a tool for problem-solving, it can also be speculative, to ask. Escherichia coli are a group of bacteria normally found in the flora of human and animal digestive tracts and symbionts participating in digestion and synthesis of certain vitamins. Currently, 171 somatic (O), 55 flagellar (H) and 80 capsular (K) antigens have been identified, and there are over 160 serological types of E. coli.E. coli are involved in the urinary tract infection (UTI.

The main difference between E coli and coliform is that the E. coli are a type of bacteria; that is, a fecal coliform whereas the coliform is a bacterium involved in the fermentation of lactose when incubated at 35-37°C. The other type of coliform bacteria is non-fecal coliforms that are Enterobacter and Klebsiella.. Fecal coliforms live inside the intestine of warm-blooded animals while. Unlike approximately 92% or E. coli, E. coli O157:H7 and nonmotile E. coli O157 strains that produce Shiga-like toxins lack the enzyme and are MUG negative. For this reason the MUG assay used in conjunction with testing for sorbitol fermentation and agglutination in E. coli O 157 antiserum is a useful screening test for toxigenic strains of O 157 E. coli (Escherichia coli) are a group of bacteria that are found in the gut of nearly all people and animals. There are many different strains of E. coli. Some cause no illness at all. Others cause minor illness, and yet others cause serious illness. Minor illnesses caused by E. coli. Some strains of E. coli cause a range of minor illnesses. Mutation Supply and Relative Fitness Shape the Genotypes of Ciprofloxacin-Resistant Escherichia coli Douglas L. Huseby,†,1 Franziska Pietsch,†,1 Gerrit Brandis,†,1 Linnéa Garoff,1 Angelica Tegehall,1 and Diarmaid Hughes*,1 1 Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden † These authors contributed equally to this work The main difference between E Coli and salmonella is that E. coli is a type of commensal bacteria that commonly lives in the lower intestine of warm-blooded animals whereas Salmonella is a facultative, intracellular pathogen in both warm-blooded and cold-blooded animals. Although most E. coli strains are harmless, some can cause serious food poisoning through food contamination

Escherichia coli - Wikipedi

Uropathogenic Escherichia coli (UPEC) is the primary etiological agent of over 85% of community-acquired urinary tract infections (UTIs). Mouse models of infection have shown that UPEC can invade bladder epithelial cells in a type 1 pilus-dependent mechanism, avoid a TLR4-mediated exocytic process, and escape into the host cell cytoplasm. The internalized UPEC can clonally replicate into. Escherichia coli may be the world's most recognized bacterial species, but this one species varies tremendously.E. coli is found almost everywhere; from soil to raw meat to human intestines. There are plenty of good E. coli strains such as those that assist in food digestion in the human intestines.However, there are also a number of harmful E. coli strains that cause urinary tract. The varied effects of beta-lactam antibiotics on cell division, cell elongation, and cell shape in E. coli are shown to be due to the presence of three essential penicillin binding proteins with distinct roles in these three processes. (A) Cell shape: beta-Lactams that specifically result in the production of ovoid cells bind to penicillin binding protein 2 (molecular weight 66,000) This image shows a dead E. coli bacterium (rod shape in center) collected in a filter after treatment with new Stanford nanoscavenger Shopping-Angebote zu e-shape vergleichen & den besten Preis finden

E. coli is Gram-negative and its envelope has three layers: cytoplasmic membrane, peptidoglycan, and outer membrane. The peptidoglycan is rigid determining the rod shape. To a good approximation, the E. coli cell has hemispherical caps and a cylindrical section in between. The peptidoglycan factories that are responsible for the growth of the. shape regulation in E. coli. Cell shape, which in many types of bacteria is determined by a mechanically rigid peptidoglycan (PG) cell wall, is crucial for bacterial motility, proliferation, adhesion, and survival.1, 2, 3 Rod-like bacteria maintain their shapes at a fixed diameter with extraordinar MORPHOLOGY OF ESCHERICHIA COLI (E. COLI) Shape - Escherichia coli is a straight, rod shape (bacillus

E coli Shape form circular Margin entire Elevation raised

Structure And Function Of A Ecoli Bacteria. E. coli is a rod-shaped bacterium. The peptidoglycan cell wall is thin and multilayered. There is a thin peptidoglycan layer placed between the inner cytoplasmic membrane, and the outer membrane. The outer membrane is surrounded by the capsule layer which is composed of polysaccharides. The flagellum. Mnnitol culture E.coli may be a new strain of E.coli because Mannitol have 9-11% NACL and every type of bacteria could not tolrate such amount of salt concentration. It need to identify on Molecular basis. Repl Antibiotic resistance in E. coli has been steadily increasing since the early 2000s despite attempts to control it, a new study suggests. In the biggest genomic survey of E. coli to date, that. Facts about Escherichia coli. Escherichia coli (E.coli) are very common bacteria in the gastrointestinal tract, and part of the normal bacterial flora. However, some E.coli strains are able to produce a toxin that could produce serious infection. The main reservoir of such E.coli strains is grass-feeding animals, cattle in particular

Morphology & Culture Characteristics of Escherichia coli

specifying cellular shape. E. coli is a rod-shaped organism and, as for all other bacteria, it is not known how this shape is determined, i.e., how genetic information is translated into cellular morphology. The expression of specificity for a certain morphology must, of course, involve assembly of the cell envelope. The E. coli - E Coli originates in intestine --> ascends to urinary tract - nephritogenic strains --> O and K antigens protect the organism from Bactericidal effect of complement and phagocytes. Diarhhea. 5 groups 1) Enteropathogenic E. Coli ( EPEC) 2) Enterotoxigenic E.Coli (ETEC

The bacteria Escherichia coli have a generation time of about 20 minutes in nutrient agar. This means that every 20 minutes, each cell present in the medium divides.If growth is not limited, doubling will continue. However, the exponential phase cannot proceed indefinitely because the medium will eventually be depleted of nutrients and. Escherichia coli (E. coli). Escherichia coli (E. coli) is a bacteria species that normally lives in the intestines of healthy people and animals.More than 700 serotypes of E. coli have been identified.Most varieties of E. coli are harmless or cause relatively brief diarrhea, but a few strains can cause severe abdominal cramps, bloody diarrhea and vomiting According to the National Kidney Foundation, 80 to 90 percent of UTIs are caused by a bacteria called Escherichia coli. For the most part, E. coli lives harmlessly in your gut. But it can cause. Causative Agent. E. coli is a bacterium with numerous serotypes, most of which normally inhabit the human intestinal tract with little ill effect.Several strains, however, secrete toxins that act on the intestinal lining and cause disease. E. coli that cause diarrheal illness can be broken down into four categories based on virulence mechanism: enterotoxigenic (ETEC), enteropathogenic (EPEC.

A large outbreak of diarrhea and the hemolytic-uremic syndrome caused by an unusual serotype of Shiga-toxin-producing Escherichia coli (O104:H4) began in Germany in May 2011. As of July 22, a. Bio. 112 Abstract Escherichia coli, Bacillus subtilis and Staphylococcus epidermidis were analyzed for this lab activity to determine their Gram Stain. After the multi-layered Gram Stain procedure each bacteria were classified as Gram-positive or Gram-negative depending on their cell walls staining color. The results showed that E. coli stained pink and classified as Gram-negative Bacteria species E. coli and S. aureus under the microscope with different magnifications. Bacteria are among the smallest, simplest and most ancient living. COLIFORM AND E. COLI BACTERIAThis article, written by the American Ground Water Trust was originally published inTHE AMERICAN WELL OWNER, 2002, Number 2]COLIFORM AND E. COLI BACTERIATesting for bacteria is the most common quality check for well water. No bacteria is the preferred result. There are many different types of bacteria that might occur in your well water

How bacteria maintain and recover their shap

In cystitis, bacteria attached to fimbrae to epithelium, cause inflammation and slough of cells. can be spread to kidneys by ureters potential kidney failure. diarrhea which may range from mild and watery to severe and bloody. abdominal cramping, pain or tenderness. proper food handling, eating only thoroughly cooked meats, washing hands after. 2,740 e coli stock photos, vectors, and illustrations are available royalty-free. See e coli stock video clips. of 28. e.coli e-coli e.coli bacteria disease resistance e coli bacteria antibiotic bacteria escherichia coli resistant bacteria e coli 3d coli. Try these curated collections Escherichia coli (E. coli) are bacteria that live in the intestines of people and animals.Most E. coli are harmless and do not cause illness.Shiga toxin-producing E. coli (STEC) make toxins that can cause severe illness.STEC is commonly heard about in the news in association with foodborne outbreaks. The most commonly recognized STEC strain is E. coli O157:H7

The gut microbiome, diet and antibiotic treatment all shape E. coli Nissle evolution in the mouse gut Contrary to common drugs, probiotics can evolve during treatment within the host. Scientists have tracked the behavior of E. coli Nissle 1917 in the mouse's gut and shown that unbalanced gut microbiomes and different diets may affect how this. Treating and preventing E. Coli can be an expensive prospect - after an outbreak, a farmer may experience a period of time with more loss than profit in his operation, writes Yvonne Dick. Glacierclean technology introduces DipTest, the cheaper, faster home-testing kit that can identify E. Coli bacterial infections in as little as 30 minutes The most common bacterium that causes a canine urinary infection is E. coli. Urinary tract infections caused by E. coli are easily treated, but if left untreated, this bacterium can lead to kidney infection or even kidney failure.. How E. Coli Causes Urinary Infections. Normal, harmless E. coli lives inside the intestines, but sometimes bad strains of the bacterium can get into certain foods. Antibiotics Susceptibility E. coli Duhok Clinical Samples 1. Background Escherichia coli is a Gram-negative, rod-shaped bacterium that typically resides in the lower intestinal tract of humans. It is also found in hospital environments and can cause nosocomial infections ().Escherichia coli is one of the most frequent causes of urinary tract infection (2, 3) and is among the most important. Which of the following bacteria possesses a spherical shape? a) E. coli b) Bacillus anthracis c) Spirilum minus d) Escherichia coli e) Staphylococcus aureus. check_circle Expert Answer. Want to see the step-by-step answer? See Answer. Check out a sample Q&A here. Want to see this answer and more

How Sulfa Drugs Work | National Institutes of Health (NIH)

Escherichia coli colony morphology and microscopic

Since Escherichia coli, Klebsiella pneumoniae, and Enterobacter aerogenes are left, another test was performed to eliminate more bacteria. The next test was a Methyl Red test. This is used to find out if a bacterium can produce acid that ferments glucose In Escherichia coli, the cytoplasmic proteins MreB and FtsZ play crucial roles in ensuring that new muropeptide subunits are inserted into the cell wall in a spatially correct way during elongation and division. In particular, to retain a constant diameter and overall shape, new material must be inserted into the wall uniformly around the cell's perimeter. Current thinking is that MreB. The women may have lived more than 2,500 miles apart, but somehow they had a unique strain of multidrug-resistant Escherichia coli bacteria in common.. Researchers at the University of California, Berkeley, found the E. coli bacteria in 48 urine samples from college students who visited health centers at UC Berkeley, the University of Michigan, and the University of Minnesota with urinary. Escherichia Coli Definition E. coli (Escherichia coli) is one of several types of bacteria that normally inhabit the intestine of humans and animals (commensal organism). Some strains of E. coli are capable of causing disease under certain conditions when the immune system is compromised or disease may result from an environmental exposure. Description. Escherichia coli is one of the most frequent causes of many common bacterial infections, including cholecystitis, bacteremia, cholangitis, urinary tract infection (UTI), and traveler's diarrhea, and other clinical infections such as neonatal meningitis and pneumonia. The genus Escherichia is named after Theodor Escherich, who isolated the ty..

Cell shape and cell-wall organization in Gram-negative

Get a 21.000 second escherichia coli bacteria (e. coli) stock footage at 29.97fps. 4K and HD video ready for any NLE immediately. Choose from a wide range of similar scenes. Video clip id 3949175. Download footage now A convenient test for quantitative measure of total coliforms and E. Coli bacteria.. Product No: 5061. A convenient test for quantitative measure of total coliforms and E. Coli bacteria. The test is designed to meet regulatory guidelines and quantifies density of target bacteria, coliforms and E. Coli, ranging from 5 to 5,000 colony forming-units (cfu) per 100 mL sample, without dilutions Gram Staining of Micrococcus luteus,Escherichia coli, and Serratia marcescens. INTRODUCTION: In 1884, a Danish botanist named Hans Christian Gram developed the popular staining technique known as the gram stain.His background in studying plants at the University of Copenhagen introduced him to observing different tissues under a microscope, and thus propelled his interest in pharmacology The Escherichia coli or E. coli , a bacteria normally found in the intestines of humans and animals. It is responsible for more than 85 percent of all urinary tract infections. Not only is there one type of E. Coli, and there is a wide variety of infections and negative symptoms that can occur when this bacteria becomes a problem

EFigures and data in cryo-EM structures of the EEnterobacter spp | Medical LaboratoriesAllied Health Sciences 141 > Wilkerson > Flashcards

2.1: Sizes, Shapes, and Arrangements of Bacteria - Biology ..

E. coli chromosome dynamics occurring throughout the cell cycle, as defined by fluorescence microscopy of living cells grown in a microfluidic device, have been analyzed in 3D at high resolution. Imaging of the nucleoid (HU-mCherry) reveals an asymmetric left-handed helicoidal ellipsoid. The shape can be seen to exert radial pushing forces at points of contact with the cell periphery, thereby. RodZ (YfgA) is a new cell shape factor in E. coli. In E. coli, the five known cell shape maintenance proteins MreBCD and MrdAB are all conditionally essential for growth. Cells lacking any of these proteins propagate stably as small spheres at low mass doubling rates, but form giant non-dividing spheroids at higher ones E. coli in the urinary tract causes more than 85 percent of all urinary tract infections, or UTIs. The bacteria, present in fecal matter, typically enters through the urethra and can be especially. In poultry production, Escherichia coli has long had a reputation as an opportunist, causing infection only after a primary pathogen had first cleared the way. But according to an expert, research shows many strains are capable of causing disease directly. And with antibiotic resistance on the rise, control and prevention are essential