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Getting Started with MicrobeWorld

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Great wave off Candida

Candida albicans is a yeast species that is part of the commensal microbiota of the body. Weakened or impaired immune system can lead to yeast infections mostly produced by Candida albicans, although other species like Candida parapsilosis, Candida glabrata and Candida tropicalis among others ar... Read More

Helicobacter fennelliae from blood culture

Helicobacter is a Gram-negative rod with a helical shape on gram stain. The most known strain is H. pylori, which causes ulcers and chronic gastritis and is said to affect up to 50% of the human population. This particular strain, Helicobacter fennelliae is most commonly found in the feces an... Read More

Unknown environmental Contaminant on blood agar plate streaked with S. pyogenes

A streak plate of Strep pyogenes on blood agar, stock culture used for class, was kept at room temp for 1 month. Before disposal a contaminant, presumably environmental, was seen on the plate. The pigment was opaque tan/yellow and with a mucoid surface. Lobate marigins with raised irregular-rh... Read More

Delftia acidovorans

Delftia acidovorans (formerly Comamonas acidovorans) is an aerobic gram-negative rod. It is unique because produces an orange color in the medium with the addition of Kovac's indole because of the production of anthranilic acid from typtone, though the organism is biochemically indole-negative. ... Read More

Swarming Motility of Pseudomonas aeruginosa

Strain: Pseudomonas aeruginosa PA14
Medium: M8 minimal medium agar plates
Incubation Conditions: 48 hours at 37°C
Pseudomonas aeruginosa is a gram-negative, rod-shaped and monoflagellated bacterium that has an incredible nutritional versatility. Swarming motility, a flagellum-dependent behavi... Read More

Paenibacillus glucanolyticus spore

Paenibacillus species have been isolated from a wide variety of sources including soil, water, the plant rhizosphere, plant materials, food, fodder, faeces and diseased insect larvae. They are facultative anaerobes or strict aerobes and mostly motile, endospore forming rods. This is the first ti... Read More

Fusobacterium mortiferum

This is a picture of a Gram stain of an anaerobic blood culture. This pleomorfic bacteria, were Gram negative filamentous bacilli with large round bodies. The identification by MALDI-TOF was Fusobacterium mortiferum. The patient has pancreatitis. I agree if you want to share this picture, since ... Read More

Can You Protect Your Tummy From Traveler's Diarrhea?

It goes by many names: Delhi belly. Montezuma's revenge. The Aztec two-step. But doctors use one not-so-glamorous term: traveler's diarrhea. Read More

The #LuxArt2015 Art Competition By My Students!

Because of all the recent interest in "microbiological art," I decided to challenge my Biology 350 students to "paint" using luminous bacteria. We have a balloting process, tallied the results, and made some appropriate awards! I think the world of my students, and I hope you enjoy this view i... Read More

Brain infection study reveals how disease spreads from gut

Diagnosis of deadly brain conditions could be helped by new research that shows how infectious proteins that cause the disease spread. Read More

Streptococcus pneumoniae mucoid strain

Streptococcus pneumoniae cells are Gram-positive, lancet-shaped cocci. Usually, they are seen as pairs of cocci, but they may also occur singly and in short chains. In this photo a mucoid strain on blood agar showing alpha hemolysis (green zone surrounding colonies). Note the zone of inhibition ... Read More

Mining Marine Microbes for New Drugs

This slideshow outlines the work of WHOI scientists Tracy Mincer and Kristen Whalen in the quest to beat antibiotic resistance through bioprospecting in the ocean. Read More

TWiP 101: Is it round or is it flat?

The doctors TWiP solve the case of the Woman with White Worms, and explore the role of a secreted growth factor from a carcinogenic parasite in wound healing and angiogenesis.


Hosts:  Read More

Agar Double Helix

Inspired by the current Agar Art Contest and the gorgeous red of a recently isolated Serratia, I thought I'd try out my first bacteria "sketch." Using Serratia, Citrobacter, and an E. coli on Hektoen Agar I whipped up this goey DNA double helix! Read More

Starch Agar

Starch agar contains high molecular weight starch molecules (soluable starch). When Iodine is added it reacts with starch to produces a dark brown/purple color. A zone of clearing forms around organisms that produce the exoenzyme amylase after addition of iodine. This plate was incubated for ... Read More

E. coli on EMB Agar

E. coli growth on EMB Agar. EMB Agar slightly inhibits gram-positive bacteria due to the combination of dyes and is a selective and differential medium for coliforms. Bacteria that ferments lactose will exhibit a green metallic sheen. This image represents E. coli as a quality control microorga... Read More

Echinococcus granulosus

This is a picture of Echinococcus granulosus from an infected liver specimen recently received in our laboratory. It is pictured in a saline wet mount at 40X magnification. The picture shows an evaginated scolex from an immature worm with hooklets.

The adult worm of Echinococcus granulosus l... Read More

Hookworm egg

Shown here is a picture of a hookworm egg found on a concentrate in an ova & parasite exam

Human hookworms include the nematode species, Ancylostoma duodenale and Necator americanus. These species have indistinguishable eggs and can only be distinguished by their larvae.

Infective larvae g... Read More

Toxoplasma parasite's greedy appetite may be its downfall

Toxoplasma gondii is estimated to chronically infect nearly one-third of the world's population, causing the condition Toxoplasmosis. It is most commonly associated with handling cat feaces and is a particular threat to pregnant women and immune-compromised individuals, such as HIV/AIDS patients... Read More

Proteus vulgaris/Swarming

Streak plate of Proteus vulgaris. The plate was incubated at 37 degree C for 48 hrs then held at room temperature for 1 week. Swarming, white growth with finger like projections at the outer edges, around the circular solated colonies, circular white/beige opaque colonies, was not seen until ... Read More
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