Hominis Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Hominis and links to relevant pages within the course.
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| The slide coagulase test is a rapid method for identifying which of the following organisms. | View Page |
| Which of the following has a life cycle that most closely resembles that of Plasmodium sp: | View Page |
| Eikenella - catalase & oxidase Eikenella corrodens (E) belongs to the HACEK group of miscellaneous gram-negative bacilli which includes Haemophilus aphrophilus (H), Actinobacillus actinomycetemcometans (A), Cardiobacterium hominis (C) and Kingella kingae (K).Cytochrome oxidase and catalase are two rapid tests that help separate the several members of this group.Eikenella corrodens shows cytochrome oxidase activity, but not catalase activity.
The positive oxidase reaction separates E. corrodens from Haemophilus aphrophilus and Actinobacillus actinomycetemcomitans, which are both negative.A. actinomycetemcomitans is also catalase positive, an additional characteristic separating it from E. corrodens, which is negative.As Kingella kingae is also oxidase positive and catalase negative, other tests are needed for differentiation. K. kingae produces acid from glucose and maltose (E. corrodens is asaccharolytic). | View Page |
| A bacterial isolate that produces pitting of the agar and has a bleach-like odor is probably E. corrodens. Closely related species that must be ruled out include: | View Page |
| Eikenella biochemicals Although not performed that often, the following tests are useful in separating E. corrodens from other closely related members of the HACEK group:KIA showing an alk/alk reaction;
Glucose fermentation (-);
Reduction of nitrates to nitrites (+);
Production of indole (-);
Ornithine decarboxylase (+)
The positive nitrate reduction reaction eliminates Cardiobacterium hominis, Kingella kingae and other Kingella species.The positive ornithine decarboxylase reaction eliminates Kingella denitrificans (which also denitrifies nitrate to nitrogen gas, a reaction negative for E. corrodens).Eikenella corrodens is asaccharolytic, whereas most other closely related species produce acid from one or more carbohydrates. | View Page |
| The trophozoite is the only morphologic form in the life cycle of: | View Page |
| Contact with infected cat feces is responsible for the transmission of: | View Page |
| Which of these parasites may be contracted by swimming in infected water? | View Page |
| Which of the following parasites have/has a life cycle that resembles that of the Plasmodium species? | View Page |
| The ELISA method may be used to detect: | View Page |
| The avoidance of laboratory diagnosis techniques that utilize water is recommended for the identification of which of these parasites? | View Page |
| Match each parasite listed here with the appropriate laboratory technique that may be used for its identification: Each answer may only be used once. | View Page |
| This suspicious form measures 12 µm by 7 µm and was found in a stool sample. | View Page |
| Recovered from a stool sample, this suspicious form measures 6 µm by 8 µm. | View Page |
| This intestinal parasite, which measures 5 µm, is usually not visible in samples processed using standard permanent stains. Special staining, as indicated by the coloring here, is helpful in its identification. | View Page |
| This parasite and Trichomonas tenax are both considered as oral non-pathogens. | View Page |
| Match each parasite named below with its respective primary symptom: | View Page |
| Match each pictured parasite with its corresponding associated condition: | View Page |
| Match each parasite name listed below with its corresponding picture: | View Page |
| Match each parasite listed here with its corresponding optimal specimen type from which it may be recovered: (Answers may be used more than once.) | View Page |
| Match each parasite listed here with its respective means of locomotion: (Answers may be used more than once.) | View Page |
| Match each pair of parasites listed here with the key morphologic characteristics that help to distinguish between them: | View Page |
| Arrange the parasites listed here in increasing order (starting with none) based on the length of their undulating membranes: | View Page |
| The presence of two sporocysts each containing four banana-shaped sporozoites is characteristic of the oocysts of which of the following organisms? | View Page |
| A 50 year old male domestic airline pilot was rushed to the hospital after complaining of tremendous fluid loss due to severe diarrhea. History revealed that the patient was diagnosed with AIDS 6 months ago. The doctor ordered a battery of tests including a stool for parasite examination. Since the sample was properly labeled indicating that the patient was immunocompromised, the lab performed both the standard processing procedures and a modified acid-fast (mod AFB) stain. The mod AFB stain revealed this suspicious form which measured a mere 4 µm. This patient is most likely infected with: | View Page |
| I measure 12 µm and am found in stool. | View Page |
| I am a mouth scavenger and measure about 10 µm. | View Page |
| I am found in stool and may be easily mistaken for "junk." I measure 12 µm. | View Page |
| I am found in stool and measure 10 µm by 8 µm. | View Page |
| I am found in stool as well as in duodenal contents. I measure 15 µm in length. | View Page |