True or False
Tularemia is an arthropod-borne disease caused by Francisella tularensis, a Gram-negative, aerobic bacillus.
True
True or False Bacitracin susceptibility is a presumptive test for the identification of alpha-hemolytic streptococci.
False. (It is used for beta-hemolytic streptococci.)
True or False
Dermatophyte fungi are all able to cause hair infections.
False. (Dermatophyte fungi cause skin infections.)
True or False Bordetella pertussis has fastidious growth requirements and usually
requires 24 hours for growth in order for agglutination tests to be performed.
False. (It requires at least 48 hrs for growth)
True or False Brucellosis is a zoonotic infection which is also known as undulant fever.
True
True or False Pneumocysitis carinii is an opportunistic parasite infecting
immunocompromised patients, such as those with AIDS.
False. (it is an atypical fungus.)
True or False
Some Streptococcus species and Neisseria species may be part of the normal flora of the upper respiratory tract.
True
True or False Haemophilus influenzae, a possible cause of meningitis in infants, is a facultative anaerobe.
True
True or False
The causative organism of scarlet fever is alpha-hemolytic and produces
an erythrogenic toxin.
False. (It is beta-hemolytic.)
*Note: Scarlet fever is a disease caused by exotoxins released by Streptococcus pyogenes.
True or False Trichophyton species may produce microconidia and Microsporum
species may produce macroconidia.
True
True or False
The Elek test is an agglutination reaction for the identification of Corynebacterium diphtheriae.
False. (it is a precipitation test.)
True or False Flavobacterium meningosepticum, implicated in nosocomial meningitis, is
a Gram-negative bacillus that is catalase positive and has peritrichous flagella.
False. (it is nonmotile.)
True or False Burkholderia cepacia is a Gram-negative facultatively anaerobic
opportunistic bacillus which infects the lungs of patients with cystic
fibrosis.
False. (It is an aerobic organism)
True or False
The heart muscle is the usual focus of infection with Corynebacterium diphtheriae in the body.
False. (it is the throat.)
True or False
A species of Haemophilus showing no growth on blood agar, growth on
blood agar with a Staph streak and growth on nutrient agar with a Staph
streak could be Haemophilus parainfluenzae.
True
*Note: Haemophilus parainfluenzae needs only factor V (NAD) to grow.
True or False Moraxella catarrhalis, a causative agent for pneumonia, is oxidase
positive and produces acid from glucose, maltose, and sucrose.
False. (it does not utilize these carbohydrates. ie. inert)
True or False Sabouraud-dextrose agar has a low pH essential for the growth of fungi.
False. (The low pH is required for inhibition of bacteria.)
True or False Legionella pneumophila is a Gram-negative bacillus which can cause Legionnaire’s disease, an often fatal pneumonia, as well as Pontiac fever,
a self-limiting, non-fatal, flu-like syndrome.
True
True or False Streptococcus pyogenes is associated with sub-acute bacterial endocarditis.
False. (It is associated with acute bacterial endocarditis.)
True or False
Candida species can be found on fruits and vegetables, on skin, and in
the genito-urinary tract.
True
True or False Bacillus anthracis is a Gram-positive, spore-forming bacillus which is catalase-positive, encapsulated, and exhibits characeristic tumbling
motility at 36°C.
False. (It is nonmotile)
True or False
Isolation of Enterococcus faecalis from a blood culture requires following up with protocols for investigating VRE.
True
True or False Borrelia recurrentis and Leptospira interrogans are spirochetes which
can be present in blood cultures from patients infected by animal contact.
True
True or False
Formation of a protein capsule is characteristic of Cryptococcus neoformans.
False. (It has a carbohydrate capsule.)
True or False Streptococcus pneumoniae is distinguished from the viridans group
streptococci by optochin susceptibility and hemolytic reactions on blood agar.
False. (The hemolytic reactions are identical ie. alpha hemolytic.)
True or False Candida albicans incubated for 2 hours at 37°C in pooled serum produces pseudohyphae.
False. (It produces germ tubes.)
True or False Listeria monocytogenes and Streptococcus agalactiae both cause neonatal meningitis and are both Gram-positive cocci which are CAMP
test positive and hydrolyze sodium hippurate.
False. (Listeria monocytogenes is a gram positive bacillus.)
True or False Urea hydrolysis is useful in the identification of Candida species.
False. (It is useful in the identification of Cryptococcus species.)
True or False Mycoplasma pneumoniae produces hydrogen peroxide, resulting in beta-hemolytic zones with greening of the periphery when these
organisms are grown on blood agar.
True
True or False
The organism usually associated with pigeon droppings in disease transmission is Candida tropicalis.
