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Time Completed: 01:07:02

Final Score 54%

98
82

Questions

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Microbiology

Pathogens

Question 76 of 180

Regarding Staphylococcus epidermidis, which of the following statements is CORRECT:

Answer:

Infection usually occurs endogenously, related to hospital devices in susceptible patients.

Staphylococcus Epidermidis

Microorganism Staphylococcus Epidermidis
Gram stain Gram positive
Shape Cocci (clusters)
Catalase Positive
Coagulase Negative
Oxygen requirements Facultative anaerobe
Additional features /
Reservoir Skin and nasopharynx
Common diseases Prosthetic joint, valve, and line related infections

Staphylococcus epidermidis is an important pathogen involving prosthetic implants, intravascular lines, ventriculoperitoneal shunts and cardiac valves.

Staphylococcus epidermidis is part of the normal flora of the skin and nasopharynx, and infection is usually endogenous.

Device removal is usually required for treatment of infections, as well as appropriate antibiotics.

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  • Biochemistry
  • Blood Gases
  • Haematology
Biochemistry Normal Value
Sodium 135 – 145 mmol/l
Potassium 3.0 – 4.5 mmol/l
Urea 2.5 – 7.5 mmol/l
Glucose 3.5 – 5.0 mmol/l
Creatinine 35 – 135 μmol/l
Alanine Aminotransferase (ALT) 5 – 35 U/l
Gamma-glutamyl Transferase (GGT) < 65 U/l
Alkaline Phosphatase (ALP) 30 – 135 U/l
Aspartate Aminotransferase (AST) < 40 U/l
Total Protein 60 – 80 g/l
Albumin 35 – 50 g/l
Globulin 2.4 – 3.5 g/dl
Amylase < 70 U/l
Total Bilirubin 3 – 17 μmol/l
Calcium 2.1 – 2.5 mmol/l
Chloride 95 – 105 mmol/l
Phosphate 0.8 – 1.4 mmol/l
Haematology Normal Value
Haemoglobin 11.5 – 16.6 g/dl
White Blood Cells 4.0 – 11.0 x 109/l
Platelets 150 – 450 x 109/l
MCV 80 – 96 fl
MCHC 32 – 36 g/dl
Neutrophils 2.0 – 7.5 x 109/l
Lymphocytes 1.5 – 4.0 x 109/l
Monocytes 0.3 – 1.0 x 109/l
Eosinophils 0.1 – 0.5 x 109/l
Basophils < 0.2 x 109/l
Reticulocytes < 2%
Haematocrit 0.35 – 0.49
Red Cell Distribution Width 11 – 15%
Blood Gases Normal Value
pH 7.35 – 7.45
pO2 11 – 14 kPa
pCO2 4.5 – 6.0 kPa
Base Excess -2 – +2 mmol/l
Bicarbonate 24 – 30 mmol/l
Lactate < 2 mmol/l

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