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Sucker-Like Structures on the Pathogenic Amoeba Naegleria fowleri

Scanning electron microscopy photograph of a human isolate of Naegleria fowleri amoeba grown in axenic culture displaying sucker-like structures, called amoebastome, used for a novel form of phagocytosis. There appears to be an inverse correlation between the mean number of suckers per amoeba an... Read More

Staphylococcus aureus bacteria

This 2005 scanning electron micrograph (SEM) depicted numerous clumps of methicillin-resistant Staphylococcus aureus bacteria, commonly referred to by the acronym, MRSA; Magnified 2381x.

Recently recognized outbreaks, or clusters of MRSA in community settings have been associated with strains... Read More

Conidial head of Aspergillus restrictus

Conidial head of Aspergillus restrictus, sterigma on vesicle bear spores Read More

b324-1 clostridium ramosum, peptostreptococcus spp, peptococcus spp and bacteroides fragilis

b324-1 clostridium ramosum, peptostreptococcus spp, peptococcus spp and bacteroides fragilis Read More

CAMP test of Group-B streptococci

If the laboratory is not able to identify group-B streptococci (GBS) by the Lancefield grouping procedure, there are other microbiologic tests that can be used to identify GBS. This picture shows one of these tests. It is called the CAMP test. CAMP is an acronym for the authors of this test (Chr... Read More

Viral desserts

At the Harvard Virology Program Retreat for 2011, the students ran a viral dessert contest. I posted some of the images at VirusTalk. Have a look at them – they are truly delicious. Read More

Escherichia coli and Salmonella paratyphi Flower on 2 EMB plates

I created these two plate cultures for a "most popular" photo scholarship contest on the web and amazingly I have received a nice popularity score thus far. The plates are of Eosin Methylene Blue Agar media with Escherichia coli as the stem and leaves and Salmonella paratyphi as the petels. If... Read More

Egg of Hymenolepis diminuta

Eggs of Hymenolepis diminuta. These eggs are round or slightly oval, size 70 - 85 µm X 60 - 80 µm, with a striated outer membrane and a thin inner membrane. The space between the membranes is smooth or faintly granular. The oncosphere has six hooks. There are no polar filaments extending into... Read More

Lyngbya Gathering

A toxin-producing cyanobacteria with natural chlorophyll fluorescence (red) and DNA stain (green).

Location: Orlando, FL, USA

Photographer: Barry Rosen, , U.S. Geological Survey Read More

erysipelothrix rhusiopathiae. gram stain of 36 hour thioglycolate broth culture (1000x)

erysipelothrix rhusiopathiae. gram stain of 36 hour thioglycolate broth culture (1000x) Read More

10 fun facts about antibiotics

This poster has ten (10) mildly interesting facts about antibiotics, just in case you needed a poster or handout for Antibiotic Awareness Week (Nov 18-24, 2013). You can download PDF at "source" URL, above. Please feel free to share this graphic with your students, classmates, colleagues, frien... Read More

Cholera enterotoxin

Intestines from infant rabbits fed cholera enterotoxin and control Read More

Plague Doctor

Doctors in the 17th Century wore penguin-like masks stuffed with flowers and herbs to protect themselves from the Plague. Image from NIH. Read More

Vibrio vulnificus bacterium

This colorized scanning electron micrograph (SEM) depicted a flagellated Vibrio vulnificus bacterium; Mag. 26367x.

Vibrio vulnificus is a bacterium in the same family as those that cause cholera. It normally lives in warm seawater and is part of a group of vibrios that are called "halophilic"... Read More

Staphylococcus aureus bacteria, MRSA

Recently recognized outbreaks, or clusters of MRSA in community settings have been associated with strains that have some unique microbiologic and genetic properties, compared with the traditional hospital-based MRSA strains, which suggests some biologic properties, e.g., virulence factors like ... Read More

Simple safranin stain of B. subtilis

Simple safranin stain of B. subtilis and central location of unstained spores. (Approx. original X 1000). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

A single virus particle, or “virion”, of measles virus

This thin-section transmission electron micrograph (TEM) revealed the ultrastructural appearance of a single virus particle, or “virion”, of measles virus. The measles virus is a paramyxovirus, of the genus Morbillivirus. It is 100-200 nm in diameter, with a core of single-stranded RNA, and is c... Read More

Actinomyces israelii

Actinomyces israelii. Molar tooth colony Read More

Gram-negative rods and coccobacilli

Gram-negative rods and coccobacilli. (Proteus vulgaris) (approx X1000). Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More

The life cycle of the malaria parasite (animation)

View an interactive animation of the life cycle of the malaria parasite, of the genus Plasmodium. The lifecycle of the malaria parasite is split between female mosquitoes and humans. In the mosquito gut, the parasites complete sexual reproduction and then multiply rapidly to produce many more p... Read More

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