Enterobacteriaceae

This image depicts a Petri dish containing a sheep’s blood agar (SBA) medium, which had been inoculated with Gram-negative Yersinia pestis bacteria. Y. pestis is the pathogen responsible for causing human plague. This was the appearance of the colonial growth after 72 hours of incubation at 25º C.People usually get plague from being bitten by a rodent flea that is carrying the plague bacterium or by handling an infected animal. Millions of people in Europe died from plague in the Middle Ages, when human homes and places of work were inhabited by flea-infested rats. Today, modern antibiotics are effective against plague, but if an infected person is not treated promptly, the disease is likely to cause illness or death.Created: 2009

Under a moderately-high magnification of 8000X, this scanning electron micrograph (SEM) revealed the presence of a small grouping of Gram-negative Salmonella typhimurium bacteria that had been isolated from a pure culture. See PHIL 10987 for a colorized version of this image.How do people catch Salmonella?Created: 2008

This image depicts a Petri dish containing a MacConkey agar medium, which had been inoculated with Gram-negative Yersinia pestis bacteria. Y. pestis is the pathogen responsible for causing human plague. This was the appearance of the colonial growth after 48 hours of incubation.People usually get plague from being bitten by a rodent flea that is carrying the plague bacterium or by handling an infected animal. Millions of people in Europe died from plague in the Middle Ages, when human homes and places of work were inhabited by flea-infested rats. Today, modern antibiotics are effective against plague, but if an infected person is not treated promptly, the disease is likely to cause illness or death.Created: 2009

Under a magnification of 2500X, this scanning electron micrograph (SEM) revealed the presence of a large number of Gram-negative Salmonella typhimurium bacteria that had been isolated from a pure culture. See PHIL 10985 for a colorized version of this image.How do people catch Salmonella?What can I do to prevent salmonellosis?- Cook poultry, ground beef, and eggs thoroughly. Do not eat or drink foods containing raw eggs, or raw (unpasteurized) milk.- If you are served undercooked meat, poultry or eggs in a restaurant, don't hesitate to send it back to the kitchen for further cooking.- Wash hands, kitchen work surfaces, and utensils with soap and water immediately after they have been in contact with raw meat or poultry.- Be particularly careful with foods prepared for infants, the elderly, and the immunocompromised.Created: 2009

This image depicts a Petri dish containing a sheep’s blood agar (SBA) medium, which had been inoculated with Gram-negative Yersinia pestis bacteria. Y. pestis is the pathogen responsible for causing human plague. This was the appearance of the colonial growth after 48 hours of incubation at 37º C.People usually get plague from being bitten by a rodent flea that is carrying the plague bacterium or by handling an infected animal. Millions of people in Europe died from plague in the Middle Ages, when human homes and places of work were inhabited by flea-infested rats. Today, modern antibiotics are effective against plague, but if an infected person is not treated promptly, the disease is likely to cause illness or death.Created: 2009

Under a very high magnification of 12000X, this scanning electron micrograph (SEM) revealed the presence of a large grouping of Gram-negative Salmonella typhimurium bacteria that had been isolated from a pure culture. See PHIL 10983 for a colorized version of this image.How do people catch Salmonella?Salmonella live in the intestinal tracts of humans and other animals, including birds. Salmonella are usually transmitted to humans by eating foods contaminated with animal feces. Contaminated foods usually look and smell normal. Contaminated foods are often of animal origin, such as beef, poultry, milk, or eggs, but any food, including vegetables, may become contaminated. Thorough cooking kills Salmonella. Food may also become contaminated by the hands of an infected food handler who did not wash hands with soap after using the bathroom.Created: 2009

This image depicts a Petri dish containing a sheep’s blood agar (SBA) medium, which had been inoculated with Gram-negative Yersinia pestis bacteria. Y. pestis is the pathogen responsible for causing human plague. This was the appearance of the colonial growth after 48 hours of incubation at 25º C.People usually get plague from being bitten by a rodent flea that is carrying the plague bacterium or by handling an infected animal. Millions of people in Europe died from plague in the Middle Ages, when human homes and places of work were inhabited by flea-infested rats. Today, modern antibiotics are effective against plague, but if an infected person is not treated promptly, the disease is likely to cause illness or death.Created: 2009

Under a moderately-high magnification of 8000X, this scanning electron micrograph (SEM) revealed the presence of a large grouping of Gram-negative Salmonella typhimurium bacteria that had been isolated from a pure culture. See PHIL 10981 for a colorized version of this image. How can Salmonella infections be treated??Salmonella infections usually resolve in 5-7 days and often do not require treatment other than oral fluids. Persons with severe diarrhea may require rehydration with intravenous fluids. Antibiotics, such as ampicillin, trimethoprim-sulfamethoxazole, or ciprofloxacin, are not usually necessary unless the infection spreads from the intestines. Some Salmonella bacteria have become resistant to antibiotics, largely as a result of the use of antibiotics to promote the growth of food animals.Created: 2009

This image depicts a Petri dish containing a MacConkey agar medium, which had been inoculated with Gram-negative Yersinia pestis bacteria. Y. pestis is the pathogen responsible for causing human plague. This was the appearance of the colonial growth after 24 hours of incubation.People usually get plague from being bitten by a rodent flea that is carrying the plague bacterium or by handling an infected animal. Millions of people in Europe died from plague in the Middle Ages, when human homes and places of work were inhabited by flea-infested rats. Today, modern antibiotics are effective against plague, but if an infected person is not treated promptly, the disease is likely to cause illness or death.Created: 2009

Under a moderately-high magnification of 5000X, this scanning electron micrograph (SEM) revealed the presence of a large grouping of Gram-negative Salmonella typhimurium bacteria, that had been isolated from a pure culture. See PHIL 10979 for a colorized version of this image.How do people catch Salmonella??Salmonella live in the intestinal tracts of humans and other animals, including birds. Salmonella are usually transmitted to humans by eating foods contaminated with animal feces. Contaminated foods usually look and smell normal. Contaminated foods are often of animal origin, such as beef, poultry, milk, or eggs, but any food, including vegetables, may become contaminated. Thorough cooking kills Salmonella. Food may also become contaminated by the hands of an infected food handler who did not wash hands with soap after using the bathroom.Created: 2009

This image depicts a Petri dish containing a sheep’s blood agar (SBA) medium, which had been inoculated with Gram-negative Yersinia pestis bacteria. Y. pestis is the pathogen responsible for causing human plague. This was the appearance of the colonial growth after 24 hours of incubation at 37º C.People usually get plague from being bitten by a rodent flea that is carrying the plague bacterium or by handling an infected animal. Millions of people in Europe died from plague in the Middle Ages, when human homes and places of work were inhabited by flea-infested rats. Today, modern antibiotics are effective against plague, but if an infected person is not treated promptly, the disease is likely to cause illness or death.Created: 2009

Under a moderate magnification of 5000X, this scanning electron micrograph (SEM) revealed the presence of numbers of clustered Gram-negative Salmonella typhimurium bacteria, that had been isolated from a pure culture. See PHIL 10975 for a colorized version of this image.What sort of germ is Salmonella?Salmonella is actually a group of bacteria that can cause diarrheal illness in humans. They are microscopic living creatures that pass from the feces of people or animals to other people or other animals. There are many different kinds of Salmonella bacteria. Salmonella serotype Typhimurium and Salmonella serotype Enteritidis are the most common in the United States. Salmonella germs have been known to cause illness for over 100 years. They were discovered by an American scientist named Salmon, for whom they are named.Created: 2009

This micrograph was stained using a fluorescent antibody staining technique (FA), which uses the specific conjugated antiserum to Fraction 1 (F1) antigen of Yersinia pestis to identify the antigens present in animal tissues, and appropriate cultures.Created: 1993

Under a very high magnification of 15000X, this scanning electron micrograph (SEM) revealed the presence of numbers of clustered Gram-negative Salmonella typhimurium bacteria, which had been grown in a pure culture. See PHIL 10973 for a colorized version of this image.What sort of germ is Salmonella?Salmonella is actually a group of bacteria that can cause diarrheal illness in humans. They are microscopic living creatures that pass from the feces of people or animals to other people or other animals. There are many different kinds of Salmonella bacteria. Salmonella serotype Typhimurium and Salmonella serotype Enteritidis are the most common in the United States. Salmonella germs have been known to cause illness for over 100 years. They were discovered by an American scientist named Salmon, for whom they are named.Created: 2009

This photograph depicts the colonial growth pattern displayed by Providencia alcalifaciens bacteria cultured on a blood agar plate (BAP).Created: 1976

Under a high magnification of 12000X, this scanning electron micrograph (SEM) revealed the presence of numbers of clustered Gram-negative Salmonella typhimurium bacteria, which had been grown in a pure culture. See PHIL 10971 for a colorized version of this image.What sort of germ is Salmonella?Salmonella is actually a group of bacteria that can cause diarrheal illness in humans. They are microscopic living creatures that pass from the feces of people or animals to other people or other animals. There are many different kinds of Salmonella bacteria. Salmonella serotype Typhimurium and Salmonella serotype Enteritidis are the most common in the United States. Salmonella germs have been known to cause illness for over 100 years. They were discovered by an American scientist named Salmon, for whom they are named.Created: 2009

This photograph depicts the colonial growth pattern displayed by Providencia alcalifaciens bacteria cultured on a Hektoen enteric (HE) agar medium; when grown on HE agar, P. alcalifaciens produces colonies very similar to those produced by Shigella spp., which are greenish-blue in color, and appear moist.Created: 1976

Under a magnification of 5000X, this scanning electron micrograph (SEM) revealed the presence of numbers of clustered Gram-negative Salmonella typhimurium bacteria that were isolated from what was a pure culture specimen. See PHIL 10969 for a colorized version of this image.What sort of germ is Salmonella?Salmonella is actually a group of bacteria that can cause diarrheal illness in humans. They are microscopic living creatures that pass from the feces of people or animals to other people or other animals. There are many different kinds of Salmonella bacteria. Salmonella serotype Typhimurium and Salmonella serotype Enteritidis are the most common in the United States. Salmonella germs have been known to cause illness for over 100 years. They were discovered by an American scientist named Salmon, for whom they are named.Created: 2009

This photograph depicts the colonial growth pattern displayed by Providencia alcalifaciens bacteria cultured on a Xylose Lysine Sodium Deoxycholate (XLD) agar plate.Created: 1976

Under a high magnification of 10431X, half that of PHIL 10566, this colorized scanning electron micrograph (SEM) revealed a colony of Gram-negative bacilli, or rod-shaped Salmonella sp. bacteria. The genus Salmonella is a member of the taxonomic family, Enterobacteriaceae, and approximately 2000 serotypes of this genis are known to cause disease in human beings.How do people catch Salmonella?Salmonella live in the intestinal tracts of humans and other animals, including birds. Salmonella are usually transmitted to humans by eating foods contaminated with animal feces. Contaminated foods usually look and smell normal. Contaminated foods are often of animal origin, such as beef, poultry, milk, or eggs, but any food, including vegetables, may become contaminated. Thorough cooking kills Salmonella. Food may also become contaminated by the hands of an infected food handler who did not wash hands with soap after using the bathroom.Created: 2008

This inoculated human blood agar culture plate cultivated colonial growth of Gram-negative, rod-shaped and facultatively anaerobic Serratia marcescens bacteria.Note the hemolytic effect induced by the presence of the S. marcescens, which was indicated by the halo surrounding each of the bacterial colonies. In these lightened area, a lysis of red blood cells (RBCs) contained in the blood agar medium had taken place. In this case the hemolytic effect is termed beta-hemolysis (ß-hemolysis), whereupon, there is a complete lysis of the RBCs. Beta hemolysis is due to the bacterial production of hemolysins. There is another type of hemolytic reaction, which is known as alpha hemolysis (a-hemolysis), in which case there would be a greenish halo visible surrounding the bacterial colonies, and is sometimes referred to as incomplete, or partial hemolysis. Alpha hemolysis is brought on due to the bacterial production of peroxides.Created: 1973

At a magnification of 20863X, this colorized scanning electron micrograph (SEM) revealed two Gram-negative bacilli, or rod-shaped Salmonella sp. bacteria. The genus Salmonella is a member of the taxonomic family, Enterobacteriaceae, and approximately 2000 serotypes of this genus are known to cause disease in human beings. See PHIL 10566 for a black and white version of this image.What sort of germ is Salmonella?Salmonella is actually a group of bacteria that can cause diarrheal illness in humans. They are microscopic living creatures that pass from the feces of people or animals to other people or other animals. There are many different kinds of Salmonella bacteria. Salmonella serotype Typhimurium and Salmonella serotype Enteritidis are the most common in the United States. Salmonella germs have been known to cause illness for over 100 years. They were discovered by an American scientist named Salmon, for whom they are named.Created: 2008

This inoculated blood agar base plate cultivated colonial growth of Gram-negative, rod-shaped and facultatively anaerobic Serratia marcescens bacteria.Created: 1973

This photograph depicts Salmonella sp. bacteria that had been cultured in a tetrathionate-enrichment broth, and stained using the direct fluorescent-antibody (FA) technique.Created: 1980