Question

11. Name an organism that fits the pattern of growth and biochemical characteristics observed in you unknown: 12. What disease might this organism cause? 13. How could the disease be treated? 14. What other test could you do to confirm the identity of your unknown? 15. What result would you expect from that test?

Answer 1

ANSWER:-

1. Staphylococcus aureus

2. disease caused:- S. aureus is one of the most common causes of bacteremia and infective endocarditis. Additionally, it can cause various skin and soft-tissue infections, particularly when skin or mucosal barriers have been breached.

S. aureus infections can spread through contact with pus from an infected wound, skin-to-skin contact with an infected person, and contact with objects used by an infected person such as towels, sheets, clothing, or athletic equipment. Joint replacements put a person at particular risk of septic arthritis, staphylococcal endocarditis (infection of the heart valves), and pneumonia.

S. aureus is a significant cause of chronic biofilm infections on medical implants, and the repressor of toxins is part of the infection pathway^.

S. aureus can lay dormant in the body for years undetected. Once symptoms begin to show, the host is contagious for another two weeks, and the overall illness lasts a few weeks. If untreated, though, the disease can be deadly.Deeply penetrating S. aureus infections can be severe.

3. The treatment of choice for S. aureus infection is penicillin

4. the tube coagulase test is usually confirmatory for S. aureus and is routinely done using either human or sheep plasma.

5.

Read as positive any degree of clot formation. Often the plasma is converted into a stiff gel that remains in place when the tube is tilted or inverted, but sometimes clots are seen floating in the fluid.

COAGULASE TEST NEGATIVE POSITIVE

Coagulase Test

1. Coagulase Positive: Clot of any size eg. Staphylococcus aureus
2. Coagulase Negative: No clot (plasma remains wholly liquid or shows only a flocculent or ropy precipitate). eg. Staphylococcus epidermidis