Human Microbiome Identification Quiz

The correct answer describes the gram morphology and typical location of Alpha Hemolytic Streptococci, as well as an associated health issue. The incorrect answers provide inaccurate details about other bacterial types and their associated locations and health issues.

Bacteroides spp. are specifically classified as Gram negative anaerobic rods and are commonly found as a normal flora in the intestine due to their role in the digestive process.

Bifidobacterium spp. are gram positive anaerobic branching rods commonly found in the human intestine as part of the normal flora. They have a symbiotic relationship with the host and play a crucial role in aiding digestion, inhibiting the growth of harmful bacteria and yeast, and are often used in probiotics for their health benefits.

Clostridium species are Gram positive anaerobic rods commonly found in the normal flora of the intestine. They are known for causing food poisoning and conditions like pseudomembranous colitis.

Coagulase negative staphylococci are a type of Gram positive Cocci that are typically found on the skin, in the vagina, and other occasional sites. They are not Gram negative rods, anaerobic bacteria, or Bacilli found in soil and water.

Coagulase-positive staphylococci, specifically staphylococcus aureus, are known for their gram positive cocci in clusters morphology and their tendency to colonize various sites in the body, causing a range of infections. The incorrect answers provided do not accurately describe coagulase-positive staphylococci.

Diphtheroids refer to Gram positive curved rods that have 'chinese character arrangements' and are commonly found on the skin. They are rarely a cause of certain nosocomial infections or may become pathogenic in immunocompromised individuals.

Eikenella Corrodens is a specific type of bacteria known for causing human bit wound infections. This bacterium is gram negative, pleiomorphic rods, facultatively anaerobic, commonly found in the oral cavity.

Enterobacteriaceae is a family of gram negative rods that are commonly found in the gut flora. They are known to cause various infections such as sepsis and UTIs.

Haemophilus Influenzae is characterized as gram negative rods, not gram positive cocci, spirochetes, or anaerobic bacteria.

Lactobacillus is a genus of Gram positive rod-shaped bacteria that are part of the normal beneficial flora of the human gastrointestinal tract and vagina.

Mycoplasma is unique in that it lacks a cell wall, doesn't gram stain in the traditional sense, and has a pleiomorphic shape that tends to be flask-shaped. It is commonly found in nature, colonizes the normal flora of the vagina, and can cause cervicitis, pelvic inflammatory disease (PID), toxic shock syndrome (TSS), and infections in newborns.

Neisseria is a genus of gram-negative bacteria that are typically found in pairs (diplococci) and commonly colonize mucosal surfaces. The most well-known species within this genus are N. gonorrhoeae, which causes gonorrhea, and N. meningitidis, which causes meningococcal disease.

Oral Spirochetes are a type of bacteria that are not truly gram reactive and are visualized on darkfield microscopy. They are part of the oral flora and are often associated with periodontal disease.

Porphyromonas gingivalis is a Gram-negative anaerobic rod commonly found in the oral flora. It is associated with periodontal disease.

Prevotella is a specific type of bacterium that is characterized as Gram negative, anaerobic, and rod-shaped. It is commonly found in the oral cavity and can contribute to conditions such as abscesses and periodontal disease.

Propionibacteria are classified as Gram positive rods, obligate anaerobes that colonize the skin, specifically the pilosebaceous glands, and are known to be the causative agent of acne vulgaris.

Yeast are not classified as viruses, live in specific environmental conditions, require nutrients, and exhibit specific characteristics as outlined in the correct answer.