Chapter 1, Problem 2SEPT

Foodborne pathogens often require the presence of a large number of microbes before an active infection results. These microbes would have a high A.) median infectious dose (ID50). B.) incubation period. C.) virulence. D.) median lethal dose (LD50). E.) mortality.

Which of the following statements is incorrect? a. Mucosal surfaces are better than skin surfaces at supporting colonization by commensal microorganisms. b. The skin provides a larger surface area than mucosal surfaces for commensal microorganisms. c. There are ten times as many bacteria residing in the intestinal tract than the number of cells in the human body. d. It is common for commensal bacteria to live in symbiosis with their human hosts. e. During gestation in mammals, a fetus does not have any commensal microorganisms on their skin or mucosal surfaces.

Which of the following is not a factor that should be considered when selecting a antimicrobial drug? A.  The nature of the microbe causing the infection B. The overall medical condition of the patient C. The origin of the drug D. The degree of susceptibility of the microbe to that drug

Why antibacterial drugs are ineffective against: A. Fungal Infections B. Viral infections C. Helminthic worm infections

which of the following definitions is not technically correct? a. broad spectrum - effective against many different types of microbes b. bacteriostatic - prevents microbes from growing c. antibiotic - microbial or synthetic product that kills or inhibits growth of microbes. d. all of the above are correct

The study of the causes of diseases is known as etiology. ___________ ____________ ___________ __________

Miracle Mineral Solution (MMS) can cure AIDS, Ebola, cancer, and malaria. Or at least that the website tells potential customers. The inventor and chief advocate of the products is Jim Humble. There is little evidence to support the fact that MMS does anything to patients aside from making them feel worse than they did before they tried it. The U.S. Food and Drug Administration (FDA) is typical in its conclusions about the so-called miracle drug. The FDA is typical in its conclusions about the so-called miracle drug. The FDA identifies it as 28 percent sodium chlorite, which , when mixed with an acid (as recommended), produces a potent form of bleach. The product’s labels suggest high oral doses for the minimum effect.  The FDA states the oral doses will produce nothing but nausea, vomiting, dehydration, and diarrhea.  Humble claims to have “treated” 100,000 patients in Mexico and other parts of the world. It is also clear that MMS has been used on pancreatic and lung cancer patients…

Attached below is the study about the effects of handwashing and the effectiveness of soap against bacteria. What conclusions can be generated from this result? A C before washing hands 10 second hand wash B D hot water only rinse 30 second hand wash Figure 8: Agar plates with bacteria A) before washing hands B) after rinsing hands in hot water C) After washing hands with soap for 10 seconds and D) after washing hands for 30 seconds. Images show that the number of bacteria on the plate are not greatly reduced after a hot water rinse or 10 second handwash but bacterial levels are reduced after a proper hand wash for 30 seconds.

Pathogenic microbes that cause disease in health care settings fall under which category of organisms? O 1) Normal flora O 2) True pathogens O 3) opportunists 3) O 4) Nosocomial