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Table 5 Clinical summary of endogenous endophthalmitis in the current study

From: Endogenous endophthalmitis: a 9-year retrospective study at a tertiary referral hospital in Malaysia

Case

Age/sex/eye

Systemic risk factors

Initial VA

Culture

Organism

Source of infection

Systemic antibiotics/antifungal

IVT abk/antifungal

Vitrectomy

Final VA

Blood

Other body fluids

Vitreous

1

49/M/R

ā€“

CF

+

+ Sputum

āˆ’

Acinetobacter sp.

Skin infection

Ciprofloxacin

Yes

Yes

6/18

2

76/F/R

ā€“

PL

āˆ’

+ Skin

āˆ’

Candida albicans

Skin infection

Fluconazole

Yes

Yes

NPL

3

49/M/L

DM

4/60

āˆ’

+ Skin

āˆ’

Staphylococcus aureus

Skin infection

Unasyn

Yes

No

6/36

4

46/F/L

ā€“

NAV

āˆ’

+ Sputum

āˆ’

Acinetobacter sp.

Lung infection

Ceftriaxone, sulperazone

Yes

No

NAV

5

39/F/L

Leukemia

6/36

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Amphotericin, fluconazole

Yes

yes

6/9

6

71/M/L

ā€“

CF

+

āˆ’

āˆ’

Klebsiella pneumonia

UTI

Cefuroxime

Yes

No

6/24

7

56/F/R

DM

NPL

āˆ’

āˆ’

āˆ’

ā€“

Lung infection

Ciprofloxacin

Yes

No

NPL

8

56/M/L

Leukemia

6/60

+

āˆ’

āˆ’

Enterobacter intermedius

ā€“

Vancomycin, moxifloxacin

Yes

No

HM

9

26/M/R

ā€“

6/36

+

āˆ’

Not done

Staphylococcus aureus

IE

Cloxacillin, gentamicin

No

No

6/36

10

26/M/L

ā€“

6/9

+

āˆ’

Not done

Staphylococcus aureus

IE

Cloxacillin, gentamicin

No

No

6/6

11

61/M/R

DM

CF

+

+ Urine

āˆ’

Candida albicans

UTI

Fluconazole, voriconazole

Yes

Yes

6/9

12

61/M/L

DM

6/36

+

+ Urine

āˆ’

Candida albicans

UTI

Fluconazole, voriconazole

Yes

Yes

6/9

13

60/M/R

DM

PL

āˆ’

+ Liver, + sputum

āˆ’

Klebsiella pneumonia

HPB infection

Ciprofloxacin, cefuroxime, metronidazole

Yes

Yes

PL

14

60/M/L

DM

PL

āˆ’

+ Liver, + sputum

āˆ’

Klebsiella pneumonia

HPB infection

Ciprofloxacin, cefuroxime, metronidazole

Yes

No

NPL

15

49/M/R

DM

HM

āˆ’

+ Urine

āˆ’

Staphylococcus aureus

DFU

Ciprofloxacin

Yes

Yes

CF

16

49/M/L

DM

HM

āˆ’

+ Urine

āˆ’

Staphylococcus aureus

DFU

Ciprofloxacin

Yes

Yes

NPL

17

52/F/L

DM

CF

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin, vancomycin

Yes

No

CF

18

57/M/L

DM, renal failure

CF

āˆ’

+ Infected catheter

+

Pseudomonas aeruginosa

DFU

Ciprofloxacin, ceftazidime, meropenem

Yes

Yes

NPL

19

38/F/L

DM

HM

āˆ’

āˆ’

āˆ’

ā€“

HPB infection

Ciprofloxacin

Yes

Yes

HM

20

71/F/R

DM

CF

+

āˆ’

āˆ’

Staphylococcus coagulase -ve

Lung infection

Cefuroxime

Yes

No

6/60

21

49/F/L

Renal failure on steroid

CF

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Fluconazole

Yes

Yes

6/12

22

68/M/L

DM, malignancy

6/12

āˆ’

+ Sputum

Not done

Pseudomonas aeruginosa

Lung infection

Ceftriaxone, cefuroxime

No

No

6/9

23

56/M/L

DM, renal failure, hydronephrosis

4/60

+

āˆ’

āˆ’

Staphylococcus aureus

Infected catheter

Cloxacillin

Yes

No

4/60

24

30/F/R

DM

PL

āˆ’

+ Urine

+

Klebsiella pneumonia

UTI

Vancomycin, ceftazidime

Yes

Yes

PL

25

65/F/R

ā€“

6/60

āˆ’

āˆ’

āˆ’

ā€“

UTI

NAV

Yes

Yes

6/24

26

19/F/R

SLE with lupus nephritis, on steroid

6/6

+

āˆ’

āˆ’

Staphylococcus aureus

Infected catheter

Vancomycin

Yes

No

6/18

27

75/F/R

DM

6/18

āˆ’

+ Sputum

Not done

Klebsiella pneumonia

Lung infection

Ciprofloxacin

No

No

6/24

28

75/F/L

DM

CF

āˆ’

+ Sputum

āˆ’

Klebsiella pneumonia

Lung infection

Ciprofloxacin

Yes

Yes

PL

29

51/F/R

DM

HM

āˆ’

+ HVS

āˆ’

Candida albicans

ā€“

Fluconazole

Yes

Yes

6/9

30

53/F/L

ā€“

HM

+

āˆ’

āˆ’

Staphylococcus aureus

ā€“

Ciprofloxacin

Yes

Yes

CF

31

49/M/L

DM

HM

NAV

NAV

āˆ’

NAV

HPB infection

NAV

Yes

Yes

CF

32

19/M/R

ā€“

HM

āˆ’

āˆ’

Not done

ā€“

Meningitis

Ciprofloxacin

Yes

No

NAV

33

65/F/L

CNS lymphoma

CF

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin

Yes

Yes

CF

34

77/M/R

ā€“

CF

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin, fluconazole

Yes

Yes

6/36

35

27/F/R

ā€“

6/24

āˆ’

āˆ’

Not done

ā€“

Lung infection

NAV

No

No

6/9

36

27/F/L

ā€“

6/24

āˆ’

āˆ’

Not done

ā€“

Lung infection

NAV

No

No

6/9

37

56/F/R

ā€“

3/60

+

āˆ’

Not done

Staphylococcus aureus

UTI

C-penicillin, unasyn

No

No

6/9

38

62/M/R

DM

6/12

+

+ Urine

Not done

Streptococcus sp.

UTI

Piperacillin-tazobactam

Yes

No

6/9

39

62/M/L

DM

PL

+

+ Urine

āˆ’

Streptococcus sp.

UTI

Piperacillin-tazobactam

Yes

No

6/18

40

34/M/R

Renal failure

HM

āˆ’

+ Urine

NAV

Klebsiella pneumonia

UTI

Sulperazone

Yes

No

3/60

41

63/M/L

DM

CF

āˆ’

+ Sputum

Not done

Klebsiella pneumonia

Lung infection

Trimethoprime, sulphamethoxazole

No

No

CF

42

30/F/R

ā€“

6/60

āˆ’

āˆ’

āˆ’

ā€“

Skin infection

Cloxacillin

Yes

No

6/6

43

30/F/L

ā€“

6/24

āˆ’

āˆ’

Not done

ā€“

Skin infection

Cloxacillin

Yes

No

6/6

44

61/F/R

DM, sigmoid colon carcinoma

CF

āˆ’

āˆ’

āˆ’

ā€“

Infected catheter

Ciprofloxacin, fluconazole

Yes

Yes

6/36

45

40/M/L

ā€“

HM

āˆ’

āˆ’

āˆ’

ā€“

HPB infection

Ciprofloxacin, meropenem

Yes

Yes

NPL

46

53/M/R

DM

HM

āˆ’

āˆ’

āˆ’

ā€“

Lung infection

Cefoperazone

Yes

No

6/60

47

53/M/L

DM

HM

āˆ’

āˆ’

āˆ’

ā€“

Lung infection

Ceftriaxone

Yes

No

HM

48

57/M/R

DM

HM

āˆ’

āˆ’

+

Staphylococcus aureus

UTI

Vancomycin

Yes

Yes

HM

49

57/M/L

DM

3/60

āˆ’

āˆ’

+

Staphylococcus aureus

UTI

Vancomycin

Yes

Yes

NPL

50

70/M/R

DM, hydronephrosis

HM

+

āˆ’

āˆ’

Staphylococcus aureus

Infected catheter

Cloxacillin, gentamicin

Yes

No

6/18

51

70/M/L

DM, hydronephrosis

HM

+

āˆ’

āˆ’

Staphylococcus aureus

Infected catheter

Cloxacillin, gentamicin

Yes

No

CF

52

19/M/L

Takayashu arteritis, renal failure on steroid

2/60

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofoxacin, ceftazidime

Yes

No

6/18

53

56/F/R

DM

6/18

+

+ Liver

āˆ’

Klebsiella pneumonia

HPB infection

Cefuroxime

Yes

No

6/18

54

56/M/R

DM

HM

+

āˆ’

āˆ’

MRSA

Infected catheter

Ciprofloxacin

Yes

No

CF

55

56/M/L

DM

CF

+

āˆ’

āˆ’

Klebsiella pneumonia

Lung infection

Ceftazidime

Yes

No

NPL

56

57/M/R

ā€“

CF

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin

Yes

No

6/12

57

57/M/L

ā€“

6/12

āˆ’

āˆ’

Not done

ā€“

ā€“

Ciprofloxacin

Yes

No

6/12

58

38/F/L

ā€“

6/9

āˆ’

+ Urine

āˆ’

Escherichia coli

UTI

Ceftazidime

No

No

6/9

59

55/M/R

DM

CF

āˆ’

+ Infected catheter

āˆ’

Staphylococcus aureus

Skin infection

Ceftriaxone

Yes

No

CF

60

7/M/R

Leukemia

6/36

āˆ’

+ Infected catheter

āˆ’

Fungal*

Septic arthritis

Itraconazole

Yes

Yes

6/9

61

42/F/R

ā€“

CF

+

āˆ’

āˆ’

Bukholderia pseudomallei

ā€“

Ciprofloxacin

Yes

No

6/24

62

63/F/R

DM

NAV

+

+ Urine/infected catheter

Not done

Klebsiella pneumonia

Skin infection

Ciprofloxacin

No

No

NPL

63

71/F/L

ā€“

HM

āˆ’

āˆ’

NAV

ā€“

Lung infection

Ciprofloxacin

NAV

NAV

NAV

64

22/F/L

Leukemia

6/24

+

āˆ’

Not done

Fungal*

ā€“

Voriconazole

No

No

6/18

65

45/M/L

DM, renal failure

NPL

+

+ Infected catheter

āˆ’

Staphylococcus aureus

Infected catheter

Cloxacillin

Yes

No

NPL

66

48/M/R

DM

CF

+

āˆ’

āˆ’

Klebsiella pneumonia

Lung infection

Ceftriaxone, amoxicillin-clavulanic acid

Yes

Yes

6/60

67

31/M/L

ā€“

CF

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin

Yes

Yes

6/6

68

54/M/L

ā€“

6/60

+

+ Sputum, CSF

+

Klebsiella pneumonia

Lung infection

Ceftriaxone, imipenem

Yes

No

NPL

69

55/M/R

DM, renal failure

HM

+

+ Infected catheter

āˆ’

Staphylococcus aureus

Skin infection

Ciprofloxacin

Yes

Yes

6/60

70

55/M/L

DM, renal failure

HM

+

+ Infected catheter

āˆ’

Staphylococcus aureus

Skin infection

Ciprofloxacin

Yes

Yes

6/36

71

14/F/L

ā€“

6/36

āˆ’

āˆ’

Not done

ā€“

ā€“

Ceftazidime, trimethoprime, sulphamethoxazole

No

No

6/18

72

42/F/L

ā€“

6/60

āˆ’

āˆ’

āˆ’

ā€“

HPB infection

Ciprofloxacin, Ceftazidime

Yes

Yes

CF

73

30/F/R

ā€“

6/12

āˆ’

+ HVS

āˆ’

Steroptococcus sp.

Genital infection

c-penicillin

Yes

No

6/12

74

67/F/L

DM

HM

āˆ’

āˆ’

āˆ’

ā€“

Lung infection

Ceftazidime

Yes

No

NAV

75

65/M/L

ā€“

CF

āˆ’

+ Liver

āˆ’

Klebsiella pneumonia

HPB infection

Ciprofloxacin, imipenem

Yes

Yes

CF

76

34/F/R

Leukemia

PL

+

āˆ’

āˆ’

Candida tropicalis

ā€“

Voriconazole

Yes

No

NPL

77

34/F/L

Leukemia

CF

+

āˆ’

āˆ’

Candida tropicalis

ā€“

Voriconazole

Yes

Yes

6/60

78

58/M/R

DM, renal failure

NPL

+

+ Urine

+

Pseudomonas aeruginosa

UTI

Ciprofloxacin, metronidazole

No

No

NPL

79

55/F/R

DM

6/60

+

āˆ’

+

Bukholderia cepacia

Meningitis

Ceftazidime

Yes

No

6/36

80

25/M/L

ā€“

PL

+

āˆ’

+

Steroptococcus sp.

ā€“

Cloxacillin

Yes

Yes

NPL

81

48/F/L

ā€“

6/60

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ceftazidime

Yes

No

6/18

82

52/F/L

DM

CF

+

+ Urine

āˆ’

Pseudomonas aeruginosa

UTI

Ciprofloxacin

Yes

Yes

CF

83

55/F/L

DM

HM

+

āˆ’

āˆ’

Klebsiella pneumonia

Lung infection

Amoxicillin-clavulanic acid, azithromycin

Yes

Yes

CF

84

74/M/L

DM, renal carcinoma

CF

āˆ’

āˆ’

āˆ’

ā€“

Skin infection

Ciprofloxacin, fluconazole

Yes

Yes

6/24

85

37/F/R

DM

HM

+

āˆ’

āˆ’

ā€“

Lung infection

Ciprofloxacin

Yes

Yes

5/60

86

66/F/R

DM

PL

āˆ’

+ Infected catheter

+

Klebsiella pneumonia

Skin infection

Ciprofloxacin

Yes

Yes

CF

87

66/F/L

DM

PL

āˆ’

+ Infected catheter

+

Klebsiella pneumonia

Skin infection

Ciprofloxacin

Yes

No

CF

88

50/F/R

DM

HM

+

āˆ’

āˆ’

Staphylococcus coagulase -ve

UTI

Ciprofloxacin

Yes

No

6/9

89

65/M/R

DM, alcoholic liver disease

CF

āˆ’

+ Urine

āˆ’

Candida albicans

HPB infection

Fluconazole

Yes

Yes

CF

90

65/M/L

DM, alcoholic liver disease

CF

āˆ’

+ Urine

āˆ’

Candida albicans

HPB infection

Fluconazole

Yes

Yes

3/60

91

49/F/L

DM

6/9

āˆ’

āˆ’

āˆ’

ā€“

Skin infection

Ciprofloxacin, fluconazole

Yes

Yes

HM

92

41/F/R

Leukemia

6/7.5

+

āˆ’

Not done

Candida tropicalis

ā€“

Voriconazole

Yes

No

6/9

93

41/F/L

Leukemia

6/60

+

āˆ’

āˆ’

Candida tropicalis

ā€“

Voriconazole

Yes

No

6/18

94

58/M/R

DM, liver disease

6/36

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ceftazidime

Yes

No

6/9

95

55/F/R

Auto-immune hepatitis on steroid and immunosuppressant

CF

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin

Yes

No

6/12

96

81/M/R

ā€“

HM

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin

Yes

Yes

6/12

97

32/F/R

Leukemia

6/24

āˆ’

āˆ’

+

Xylariaceae sp.

ā€“

Voriconazole

Yes

Yes

CF

98

32/F/L

Leukemia

6/12

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Voriconazole

Yes

Yes

6/12

99

63/F/R

ā€“

HM

āˆ’

āˆ’

+

Staphylococcus coagulase -ve

Skin infection

Ciprofloxacin

Yes

Yes

6/9

100

54/M/L

DM, renal failure

PL

+

+ Infected catheter

+

Staphylococcus aureus

Infected catheter

Ciprofloxacin, amoxicillin-clavulanic acid

Yes

No

NPL

101

46/F/R

DM

HM

āˆ’

āˆ’

+

Penicillium sp.

ā€“

Amphotericin, fluconazole

Yes

Yes

CF

102

64/M/L

DM, rectal carcinoma

PL

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin

Yes

Yes

HM

103

66/M/L

DM

6/24

+

āˆ’

+

Mycoplasma pneumonia

Lung infection

Ciprofloxacin, azithromycin

Yes

Yes

6/9

104

59/F/L

DM, renal failure

HM

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin

Yes

Yes

CF

105

70/M/R

DM

PL

āˆ’

āˆ’

+

Penicillium sp.

ā€“

Itraconazole

Yes

Yes

6/36

106

41/F/R

DM

HM

āˆ’

āˆ’

āˆ’

ā€“

Lung infection

Ciprofloxacin

Yes

Yes

PL

107

67/M/L

DM

6/9

+

+ Urine

+

Escherichia coli

UTI

Ciprofloxacin

Yes

Yes

CF

108

63/M/R

ā€“

1/60

+

+ Infected catheter

+

MRSA

Skin infection

Vancomycin, ciprofloxacin

Yes

Yes

6/9

109

63/M/L

ā€“

6/24

+

+ Infected catheter

Not done

MRSA

Skin infection

Vancomycin, ciprofloxacin

No

No

6/12

110

52/M/L

DM, renal failure

HM

āˆ’

āˆ’

+

Phanerochaete chrysosporium

Skin infection

Voriconazole

Yes

No

CF

111

45/M/R

DM, renal failure

PL

+

āˆ’

āˆ’

Staphylococcus aureus

Infected catheter

Cloxacillin

Yes

Yes

NPL

112

47/M/R

Alcoholic liver disease on steroid

6/12

+

āˆ’

Not done

Staphylococcus aureus

Skin infection

Cloxacillin

No

No

6/9

113

47/M/L

Alcoholic liver disease on steroid

6/12

+

āˆ’

Not done

Staphylococcus aureus

Skin infection

Cloxacillin

No

No

6/9

114

58/M/L

DM

PL

+

+ Infected catheter

+

MRSA

Genital infection

Ciprofloxacin

Yes

Yes

HM

115

67/F/R

ā€“

6/36

āˆ’

+ Urine

+

Klebsiella pneumonia

UTI

Cefuroxime

Yes

Yes

CF

116

48/M/L

DM

HM

āˆ’

āˆ’

Not done

ā€“

Skin infection

Ciprofloxacin

Yes

Yes

6/18

117

78/F/L

ā€“

CF

āˆ’

āˆ’

+

Staphylococcus coagulase -ve

ā€“

Ciprofloxacin, ceftazidime

Yes

Yes

3/60

118

61/F/L

DM

PL

āˆ’

+ Urine

āˆ’

Klebsiella pneumonia

UTI

Ciprofloxacin, meropenem

Yes

Yes

CF

119

55/F/L

DM

3/60

+

+ Sputum

āˆ’

Klebsiella pneumonia

Lung infection

Ceftazidime

Yes

Yes

6/12

120

55/M/L

ā€“

PL

+

āˆ’

+

Klebsiella pneumonia

HPB infection

Ceftriaxone, ciprofloxacin, metronidazole

Yes

No

NPL

121

60/M/R

DM

PL

+

+ Infected catheter

+

Staphylococcus aureus

Skin infection

Cloxacillin, ceftazidime

Yes

No

HM

122

60/M/L

DM

PL

+

+ Infected catheter

+

Staphylococcus aureus

Skin infection

Cloxacillin, ceftazidime

Yes

Yes

HM

123

40/F/R

DM/liver cirrhosis, myelodysplastic syndrome

6/18

+

+ Infected catheter

āˆ’

Klebsiella pneumonia

Lung infection

Cefuroxime, piperacillin-tazobactam

Yes

Yes

CF

124

32/F/L

DM

6/60

+

āˆ’

āˆ’

Klebsiella pneumonia

UTI

Cefuroxime

Yes

No

6/12

125

34/F/L

DM

HM

āˆ’

+ Urine

+

Candida albicans

ā€“

Amphoterin

Yes

Yes

6/18

126

57/F/R

DM

PL

+

āˆ’

āˆ’

Klebsiella pneumonia

AGE

Ciprofloxacin

Yes

Yes

NAV

127

48/M/R

DM

PL

āˆ’

āˆ’

āˆ’

ā€“

DFU

Ciprofloxacin, Ceftazidime

Yes

No

NPL

128

65/F/R

DM

1/60

āˆ’

+ Urine

āˆ’

Klebsiella pneumonia

UTI

Ciprofloxacin

Yes

No

6/60

129

65/F/R

DM, renal failure

HM

āˆ’

āˆ’

āˆ’

ā€“

ā€“

Ciprofloxacin

Yes

Yes

CF

130

72/F/L

DM

HM

āˆ’

+ Urine

āˆ’

Escherichia coli

UTI

Ciprofloxacin, trimethoprime, sulphamethoxazole

Yes

No

NPL

131

55/F/R

DM

HM

+

āˆ’

āˆ’

Klebsiella pneumonia

HPB infection

Ceftriaxone

Yes

Yes

HM

132

67/M/R

Adenocarcinoma of lung and colon

HM

āˆ’

āˆ’

āˆ’

ā€“

Infected catheter

Fluconazole, voriconazole

Yes

Yes

NPL

133

68/F/L

DM, renal failure

CF

+

āˆ’

āˆ’

Elizabethkingia meningocepticum

Infected catheter

Ceftazidime, cefazolin, vancomycin

Yes

No

CF

134

68/F/R

DM, renal failure

6/24

+

āˆ’

āˆ’

Elizabethkingia meningocepticum

Infected catheter

Ceftazidime, cefazolin, vancomycin

Yes

No

6/12

135

61/F/L

DM, renal failure

HM

+

āˆ’

āˆ’

Staphylococcus aureus

Infected catheter

Cloxacillin

Yes

No

6/36

136

44/M/L

DM

PL

+

+ Liver

+

Klebsiella pneumonia

HPB infection

Ceftazidime, imipenem

Yes

No

NPL

137

65/M/L

DM, chronic cystitis

CF

āˆ’

+ Urine

āˆ’

Klebsiella pneumonia

UTI

Ciprofloxacin

Yes

Yes

CF

138

59/F/L

DM, renal Failure

HM

āˆ’

āˆ’

āˆ’

ā€“

Skin infection

Ciprofloxacin

Yes

Yes

6/18

139

67/F/L

Hepatolithiasis

PL

+

+ Liver

āˆ’

Klebsiella pneumonia

HPB infection

Ciprofloxacin, imipenem

Yes

No

NPL

140

76/M/R

DM

CF

āˆ’

+ Urine

āˆ’

Candida albicans

UTI

Fluconazole

Yes

Yes

6/9

141

76/M/L

DM

CF

āˆ’

+ Urine

āˆ’

Candida albicans

UTI

Fluconazole

Yes

Yes

6/24

142

38/F/R

ā€“

HM

āˆ’

āˆ’

+

Pseudomonas aeruginosa

ā€“

Ceftriaxone, ciprofloxacin, metronidazole

Yes

Yes

HM

143

69/M/L

DM

HM

+

+ Urine

+

Klebsiella pneumonia

UTI

Cefepime, amoxicillin-clavulanic acid

Yes

Yes

1/60

  1. Abbreviation: IVT intravitreal, abk antibiotic, DM diabetes mellitus, NAV not available, UTI urinary tract infection, IE infective endocarditis, HPB hepatobiliary, DFU diabetic foot ulcer, AGE acute gastroenteritis, MRSA methicillin-resistant Staphylococcus aureus, CF counting finger, HM hand movement, PL perception of light, NPL non-perception of light