(a)
To discuss:
The condition from which the patient is suffering also determines the likely causative agent of this condition.
Case summary:
A farmer who works on a piece of machinery gets injured by a sharp blade covered in mud slices through his upper arm. The farmer tries to control the bleeding and immediately seeks medical care. After three days, his arm becomes swollen and painful and fever develops. After removing the bandages, he observes that the wound has become blackened and bloody fluid leaking out of it. Microscopic analysis of fluid shows the presence of gram-positive bacilli.
(b).
To explain:
The process by which the patient contracted this pathogenic microbe and also determines the virulence factors that contributed to the pathogenesis at the wound site.
Case summary:
A farmer who works on a piece of machinery gets injured by a sharp blade covered in mud slices through his upper arm. The farmer tries to control the bleeding and immediately seeks medical care. After three days, his arm becomes swollen and painful and fever develops. After removing the bandages, he observes that the wound has become blackened and bloody fluid leaking out of it. Microscopic analysis of fluid shows the presence of gram-positive bacilli.
(c).
To explain:
The treatment involved in hyperbaric therapy and the process by which it can be therapeutic to the patient.
Case summary:
A farmer who works on a piece of machinery gets injured by a sharp blade covered in mud slices through his upper arm. The farmer tries to control the bleeding and immediately seeks medical care. After three days, his arm becomes swollen and painful and fever develops. After removing the bandages, he observes that the wound has become blackened and bloody fluid leaking out of it. Microscopic analysis of fluid shows the presence of gram-positive bacilli.

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Chapter 18 Solutions
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