A macrophage (pale brown) interacts with Borrelia cells (blue), the spirochete bacteria that cause Lyme disease. Although the outer membrane of Borrelia contains a strong antigen, the OspC protein, the bacterium successfully evades the human immune system by hiding out in places less accessible ... Read More
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
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
Life cycle (illustration) of Chlamydia trachomatis 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
Blastomyces dermatitidis. Yeast from tissue smear. Gomori methenamine silver nitrate stain. (400x) 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
photograph of erysipelothrix rhusiopathiae infection in the thumb of an abattoir worker Read More
Cladosporium carrioni in chromomycosis. Brown Sclerotic cells. H & E stain Read More
Alison O'Brien, President at American Society for Microbiology and professor and chair of the Uniformed Services University of the Health Sciences’ (USU) Department of Microbiology and Immunology, in Philadelphia.
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
Unknown yeast isolated on TSA from a swab taken from the bottom of a shoe incubated at 25 degrees C. Yellow, mucoid, round colonies were seen after 2 weeks. This isolate grew equally well at 37 degree C with a growth time of ~ 1 week. Read More
Diagnosis of deadly brain conditions could be helped by new research that shows how infectious proteins that cause the disease spread. Read More
A computer model shows side and top views of two different proteins produced by anthrax bacteria. The green molecule is "protective antigen" (PA), which spontaneously forms pores that penetrate organic membranes such as cell walls. The yellow molecule is "lethal factor (LF)." When a voltage is a... Read More
Serratia spp. are widely distributed in nature. Serratia marcescens is the most common Serratia sp. associated with human disease, followed by strains of the S. liquefaciens complex: S. liquefaciens, S. grimesii and S. proteamaculans. The clinical significance of these species is largely unknown... Read More
Trichomonas vaginalis is a protozoan parasite of the urogenital tract in men and women and causes a sexually transmitted disease, trichomoniasis, in about half of infected women. Infections are associated with pelvic inflammatory disease, adverse pregnancy outcomes, infertility, an increased inc... Read More