Which of the following is false concerning Salmonella and Shigella? A. Shigella are H2S + and motile, Salmonella are H2S - and n
onmotile. B. Salmonella Typhi causes typhoid fever with serious systemic spread. C. Shigella cause bacillary dysentery. D. There is a capsule and an attenuated living vaccine for typhoid fever. E. Shigella dysenteriae produces the most severe form of shigellosis and may lead to HUS and kidney damage due to production of Shiga toxin.
A. Shigella are H2S + and motile, Salmonella are H2S - and nonmotile
Explanation:
<em>Shigella</em> is a genus of Gram-negative (i.e., they have a cell wall composed of a thin layer of peptidoglycan), nonmotile, and facultative anaerobic bacteria; whereas <em>Salmonella</em> species are Gram-negative and facultative anaerobic bacteria. Moreover, <em>Salmonella</em> are motile bacteria, in a similar way to other human pathogenic bacteria (e.g., <em>Vibrio cholerae, Pseudomonas aeruginosa</em>, and <em>E. coli</em>). Salmonella can produce hydrogen sulfide (H2S) from thiosulfate or sulfite; whereas <em>Shigella</em> species are unable to produce hydrogen sulfide. Typhoid fever, also known as enteric fever, is an infection caused by <em>S. typhi</em> that can spread throughout the body and affect different organs (i.e., it is a multisystemic illness). Vivotif (Typhoid Vaccine Live Oral Ty21a) is a live attenuated bacterial vaccine used for oral administration only; whereas Vi capsular polysaccharide vaccine (ViCPS) is a vaccine administered by injection. Finally, shigellosis is an infection that affects the digestive system caused by <em>Shigella</em> bacteria. In this regard, <em>S. dysenteriae </em>produces a potent cytotoxin known as 'Shiga toxin' that may cause local destruction of the colonic epithelium.
Answer: Preventing diseases.The main focus of public health informatics is to keep an eye on the general health of the public.This does not involves focus on the health of individual rather it focuses on the health of population.The main objective of this is to prevent disease not to cure disease or injury.Little alteration in environmental can help prevent diseases that puts the human population at risk.
Explanation: Baroreceptors are pressure receptors. The normal set point is 100 nnHg, which means that when the value is 160 mmHg the gain is 60, when the system is running the value is 120 mmHg that is still above 20 mmHg of the normal set point that It is 100 mmHg. Taking every 20 as a unit, the value of 20 above continues to be 40 below 160 when the system did not work, which equals - 2 which is equal to 40 = 2 (20).
