Bacitracin test done on a lawn of Streptococcus pyogenes grown on blood agar. The zone of inhibition around the bacitracin disc, approx 14mm measuring the entire length of the zone, indicates sensitivity. The zone of inhibition is red because the red blood cells did not lyse. Grown for 24 hr... Read More
Candida species on a Candida CHROMagar plate wishes you a happy and safe Fourth of July!
Author: Xiao Hui Lau Read More
Many air travelers are concerned about the risks of catching a disease from other passengers given the long time spent in crowded air cabins. New research shows disease-causing bacteria can linger on surfaces commonly found in airplane cabins for days, even up to a week. Participants discuss ... Read More
Line inoculation of Micrococcus luteus on a TSA slant showing Filiform, uniform growth, along the margin. Culture was grown for 3 days at 37 degrees, M. luteus usually takes 3+ days for good growth. Read More
Disease-causing viruses engage their hosts in ongoing arms races: positive selection for antiviral genes increases host fitness and survival, and viruses in turn select for mutations that counteract the antiviral host factors. Studying such adaptive mutations can provide insights into the distan... Read More
It is a well recognized uncommon cause of skin and nail infection of the hands and feet . Unlike Dermatophytosis these mould infections are not contagious. There are few reports of invasive infection caused by N. dimidiatum; most infections occurred in immunocompromised hosts. Arthrospores are ... Read More
Simple stain done on an unknown bacteria, showing feathery rhizoid growth on TSA after a 48 hr incubation at 37 degree’s C, isolated from a floor swab. Single bacillus and diplobacillus can be seen though out. Read More
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
Please help me! I am planning to identify this microorganism by API but I can not identify the shape (rod or cocci). This microorganism has positive oxidase. Its colony is red, irregular, flat.
Please teach me. Thanks so much! Nhu Thuy from Vietnam
Use of a jet injector during the 1976 New Jersey Influenza A immunization project. 45 million adults in the United States received a vaccine containing the A/New Jersey/76 influenzavirus ("swine flu" virus).
Image via the CDC's Flickr site. Read More
A mixture of lichens. Taken from the Wistreich Collection, appearing exclusively on MicrobeWorld. Read More
Scientists uncover a port of liver entry for malaria parasites in a report published in The Journal of Experimental Medicine. If these results hold up in humans, drugs that target this entry protein might help prevent the spread of disease. Read More
It's Friday and I can finally enjoy the beach! So I thought it would be nice to reflect my excitement at work growing this happy Listeria monocytogenes ;) Read More
Having recently (and barely) recovered from a tangle w/ this character - the Norovirus - I've a new found respect for it's potency.
After all, anything that can reduce a grown man to a weak as a kitten, aching, cursing his immune system wretch should be rightly acknowledged as worthy. Read More
TORONTO, Aug. 17, 2015--Promoting breastfeeding could lead to a substantial reduction in common infections and even deaths that are more common in Indigenous infants than non-Indigenous infants, a new study suggests. Read More
A quick demonstration of how my Microbial Mania can impact the holiday season! Read More
This confocal micrograph, taken as part of a synthetic biology project, shows Bacillus subtilis, a Gram-positive, rod-shaped bacterium that is commonly found in soil. Distinct lineages of bacteria expressing different fluorescent proteins were initially mixed randomly on a petri dish. As the bac... Read More
Mannitol Salt Agar (MSA)
•Important Ingredients: Phenol red, mannitol (sugar), 7.5% NaCl
•Differential: between pathogenic S. aureus and S. epidermidis
•Selective: NaCl inhibits non-halophilic organisms. Organism that can grow are halophilic.
•Mannitol Fermentors: fermentation of acid cau... Read More
Three organisms inoculated in TSB to look at tube morphology. From left to right:
Staphylococcus aureus: flocculent growth/turbid, growth throughout the tube.
Mycobacterium smegmatis: pellicle, growth at the top of the tube. M. smegmatis tends to stick to the tube and grow up the side.
Ba... Read More