🕳Procedure of String Test

1⃣Take a clean grease free slide and add a drop of 0.5% sodium deoxycholate or Sodium taurocholate.

2⃣Emulsify an organism in the slide using an inoculating loop.

3⃣Keep on rubbing the loop vigorously for 2-3 minutes until the liquid appears viscous.

4⃣Then, pull the inoculating loop upwards from the slide.

4⃣Observe for a mucoid “string”.

📶Result of String Test📶

➕Positive Test➕: Appearance of String thread like mucoid when the loop is pulled upwards.
🈁Examples: Vibrio cholerae

➖Negative Test➖: No appearance of String when the loop is pulled upwards.
🈁Examples: Aeromonas spp. and P. shigelloides
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🔝Str.pneumoniae
Bile S T +ve
Draughtmans appearance
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🕳Draughtsman appearance of colonies of S. pneumoniae
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🕳Str.agalactia
CAMP test +ve
Hippurate hydrolysis test +ve
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🕳E.fecalis
Litmus milk reduction test +ve
Bile asculin +ve
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🕳Str.pneumoniae
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🕳str.pyogens
🕳PYRase +ve
🕳Beta hemolysis
🔝bactracin sensetive
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🧪Str.pyogens
🕳Beta hemolysis
🕳bacitrcin sensetive
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🔬Widal test
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🔬Widal test
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🔬Widal test
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🔬Widal test
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🔬Widal test reagent
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🔬Widal test
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🔬Widal test
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🔬Widal test
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🔬Widal test by tube method
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🔬Widal test
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🔬Widal Test
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🔬Widal test
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