Concept explainers
Introduction:
African sleeping sickness or African trypanosomiasis is a disease endemic to Africa. It is caused by a flagellated protozoan, Trypanosomabrucei, and transmitted by the bite of its biological vector, the tsetse fly on human skin. The pathogenesis includes the multiplication of the T.brucei on the site where tsetse fly has attackedthe skin.
After multiplying in number, these
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NESTER'S MICROBIOLOGY
- The following statements about Streptobacillus moniliformis are all true excepta) it can be transmitted by food contaminated with rodent feces.b) pet store workers are at increased risk of infection.c) it can be transmitted by the bites of animals other than rats.d) human infection is characterized by irregular fevers, rash, and joint pain.e) it is a Gram-positive spore-forming rod.arrow_forward33) Which of the following is a common cause of mycoses? A) Opportunistic Infection B) Overwhelming Exposure C) Suppressed Immune System D) All of the above are causes of mycosesarrow_forwardWhich of the following statements is false?a) A botulism epidemic that results from improperly canned green beans is an example of a common-source outbreak.b) Droplet nuclei fall quickly to the ground.c) Congenital syphilis is an example of a disease acquired through vertical transmission.d) Plague is endemic in the rock squirrel population in parts of the United States.e) The first case in an outbreak is called the index case.arrow_forward
- Which of these statements concerning cryptococcal meningoencephalitis is true?a) It is caused by a yeast with a large capsule.b) It is a disease of trees transmissible to humans.c) It typically attacks the meninges but spares the brain.d) Person-to-person transmission commonly occurs.e) It is seen only in persons who are immunocompromised.arrow_forwardWhich of these statements concerning the causative agent of listeriosis is false?a) It can cause meningitis during the first month of life.b) It is a Gram-positive rod that can grow in refrigerated food.c) It is usually transmitted by the respiratory route.d) Infection can result in bacteremia.e) It is widespread in natural waters and vegetation.arrow_forwardWhich disease has an environmental reservoir (1.e., soil, water)? A) O pneumonia B) O rabies C) O listeriosis D) Omeningitis E) O gonorrheaarrow_forward
- 34) Which of the following fungal diseases involves an intracellular parasite that partially disables macrophages, allowing for spread beyond the lungs. A) Coccidioidomycosis C) Pneumocystis B) Blastomycosis D) Histoplasmosis 35) Of the following genetic material types seen in viruses, which genetic material type leads to rapid, almost immediate production of viral proteins, followed closely by replication of the genome leading to rapid synthesis of new viruses, which tends to overwhelm the host, as exemplified in a viral disease which causes more than 200,000 deaths of children worldwide each year. A) negative (-) strand single-stranded RNA B) double-stranded RNA D) positive (+) strand single-stranded RNA C) single-stranded DNAarrow_forwardExplain how each of the following could lead to the reemergence of malaria in the United States: (a) global warming, (b) increased travel of individuals from endemic regions to the United States, (c) increased immigration of individuals from endemic regions to the United States, and (d) laws protecting wetlands. Please simple to understand and original answer. Thanks :)arrow_forwardWhich symptom is least likely to occur as a result of tertiary syphilis?a) Gummasb) White patches on mucous membranesc) Emotional instabilityd) Strokee) Blindnessarrow_forward
- Which of these statements about tetanus is true?a) It can start from a bee sting.b) Immunization is carried out using tiny doses of killed C. tetani.c) Those who recover from the disease are immune for life.d) Tetanus immune globulin does not prevent the disease.e) It is easy to avoid exposure to spores of the causative organism.arrow_forwardWhich of these statements concerning foodborne botulism is false?a) It is not a central nervous system infection.b) Blurred vision is an early symptom.c) Food can taste normal but still cause botulism.d) Treatment is based on choosing the correct antibiotic.e) Control of the disease depends largely on proper food-canning techniques.arrow_forwardwhich of these statements is false? a) a longer incubation period makes a disease more likely to spread far b) the young and old are more susceptible to many diseases c) malnourishment increases the risk of catching most diseases d) being exposed to a small number of pathogens is unlikely to cause diseasearrow_forward
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