PT Instructions

WEEK 08: 16 & 17 FEBRUARY 2026 RUN

PURPOSE

To provide for detailed instructions for participants in compliance with the requirements of ISO 17043, clause 4.6.1

INSTRUCTIONS

Scheme

reference

Samples Samples Reconstitution and Techniques Testing Timeframe Approved Test Methods Result Sheet for submission of Results to JGK Unit of Measurement (Results) Number of Test Replicates per sample
Type Identification

(as per the labels)

Storage
JGKPT01

Antimicrobial susceptibility

(Clin. Pathogens)

2 x FD cultures

 

ATB01/C – Cattle isolate

ATB02/C – Dog isolate

2-8oC Allow cultures and sDH2O to adjust to room temperature.

Remove seals and bungs from the vials and add 750 µl sDH2O to each vial.

Allow the pellet to dissolve completely. If necessary, tilt the vial at various angles to ensure all materials are dissolved. Immediately, saturate a sterile swab with the reconstituted sample and inoculate 1/3 of the agar/culture plates (per the lab’s SOP)—streak with a sterile loop to facilitate discrete colonies.

 

Proceed with Antibiogram testing as per the Lab’s SOP

These samples are short-term samples; not intended for long-term storage.

Preferably, test the samples immediately upon receipt and reconstitution.

 

For short-term storage, keep the samples between 2 °C and 8 °C.

Disc diffusion technique

(Kirby Bauer)

R.E.F. 01.02

(available on www.jgklab.co.za)

Zone Ø in millimeters.

Report results as:

Sensitive (S), Intermediate (I), Resistance (R)

Culture ID: 1

 

Susceptibility

(supplied discs): 3 as per the result sheet

Antimicrobial discs

(x 18+)

Kanamycin 30 µg; Oxoid 3698274; exp. 12/07/2026.

Oxytetracycline 30 µg; Oxoid 6265879; exp. 14/05/2028.

Penicillin G 10 IU; Oxoid 6220791; exp. 21/01/2028.

Discs are ready to use (Commercial discs)
JGKPT03

Brucella: RBT

(Samples for Labs doing RBT only)

6 x FD cattle sera RBT01 – RBT06 2-8oC Reconstitution:

Allow sera and sDH2O to adjust to room temperature.

Remove seals and bungs, and add sDH2O as follows:

Sample/vial 1: 300 µl

Sample/vial 2: 500 µl

Sample/vial 3: 500 µl

Sample/vial 4: 350 µl

Sample/vial 5: 500 µl

Sample/vial 6: 550 µl

Do not add cold water.

Reconstituted samples must be mixed on the vortex and tested immediately.

 

There must be no clots in the serum when tested

RBT only R.E.F 03

(available on www.jgklab.co.za)

Positive (low, medium, high)

 

Or

 

Negative

1
JGKPT04

Brucella: RBT and CFT

(Samples for Labs doing both RBT and CFT)

6 x FD cattle sera RBT/CFT01 – RBT/CFT06 2-8oC Reconstitution:

Allow sera and sDH2O to adjust to room temperature.

 

Remove seals and bungs and add sDH2O to samples as follows:

 

Samples 1, 2, 3, 4, 5: add 500 µl.  Sample 6: add 550 µl.

 

Do not add cold water.

Reconstituted samples must be mixed on the vortex and tested immediately.

 

There must be no clots in the serum when tested

RBT and CFT RBT: R.E.F 03

CFT: R.E.F 04

(available on www.jgklab.co.za)

RBT:

Positive (low, medium, high)

Or

Negative

1
CFT:

Option 1: Endpoint reaction (e.g., 1/4 ++++, 1/128+)

 

Option 2: Titer in CFTIU (e.g., 24, 480)

 

 

 

 

2

 

 

 

 

JGKPT05

Brucella: MRT

4 x bulk tank milk

(not preserved)

CAM01 – CAM04 2-8oC N/A

Ready to process

Test immediately upon receipt MRT R.E.F 05

(available on www.jgklab.co.za)

Positive (weak, strong) Or

Negative

1
JGKPT06

Brucella: Culture & Identification

3 x FD cultures

 

CAC01 – CAC03 2-8oC Allow cultures and sDH2O to adjust to room temperature.

Remove seals and bungs from the vials and sDH2O as follows: 1 ml to sample 1, 750 µl to sample 2, and 500 µl to sample 3.

Allow the pellet to dissolve completely. If necessary, tilt the vial at various angles to ensure all materials are dissolved. Immediately, saturate a sterile swab with the reconstituted sample and inoculate 1/3 of the agar/culture plates (per the lab’s SOP)—streak with a sterile loop to facilitate discrete colonies.

These samples are short-term samples; not intended for long storage.

Preferably, test the samples immediately upon receipt.

 

For short-term storage, keep the samples between 2 °C and 8 °C.

Conventional microbiology

 

and

 

Molecular technique

R.E.F 06

(available on www.jgklab.co.za)

Presence or Absence of Brucella abortus

 

And

Strain:

Field or vaccine

1
JGKPT09

Clinical Microbiology:

 

Salmonella Poultry

3 x FD cultures SAP01 – SAP03 2-8oC Reconstitution:

Allow cultures and sDH2O to adjust to room temperature.

Remove seals and bungs and add 750 µl sDH2O to each Sample/vial.

 

Allow the pellet to dissolve completely. If necessary, tilt the vial at various angles to ensure all materials are dissolved. Immediately, saturate a sterile swab with the reconstituted sample and inoculate 1/3 of the agar/culture plates (per the lab’s SOP)—streak with a sterile loop to facilitate discrete colonies.

These samples are short-term samples; not intended for long storage.

Preferably, test the samples immediately upon receipt.

 

For short-term storage, keep the samples between 2 °C and 8 °C.

Conventional microbiology

 

and

 

Molecular technique

R.E.F 08-10

(available on www.jgklab.co.za)

Presence or Absence of Salmonella. 1
JGKPT10

Clinical Microbiology:

 

Salmonella Mammals

3 x FD cultures SAM01 – SAM03 2-8oC 1
JGKPT35 & 37

Trichomonas and Campylobacter ID by Culture

5 x Cultures in transport media SW01 – SW05 2-8oC N/A

Ready to process

Test immediately upon receipt Conventional microbiology R.E.F 35-38

(available on www.jgklab.co.za)

Presence or Absence of

Trichomonas foetus/ Campylobacter fetus

1
JGKPT36 & 38

Trichomonas and Campylobacter ID by PCR

Molecular technique 1
 

Treatment of samples

No special treatment should be given to the PT samples. They [PT samples] should be handled in the same manner as all the other samples routinely tested in the laboratory, including TAT

 

 

Handling and safety requirements

Contact surfaces must be decontaminated with 70% alcohol or other suitable disinfectants. Used laboratory utensils must be cleaned and sterilized as per the laboratory standard operating procedure. Unused materials and waste must be removed as per laboratory waste management protocol. This involves autoclaving and/or removal by an approved waste removal company.

 

 

Specific environmental conditions required for the participant to conduct tests:

JGKPT06 (Brucella Culture) must be handled in a biological safety cabinet class 2+

 

 

Results recording

Only the supplied Excel “Result entry forms” [R.E.F] should be used to capture the PT results. The R.E.F are available online (www.jgklab.co.za) and can be downloaded under “PUBLICATIONS >> RESULT SHEET”. All the fields of the R.E.F must be filled.

 

 

Submission of PT results to JGK

All results must be submitted on Wednesday, 11th of March 2026. Any results received after this date will not be included in the analysis.

 

 

Enquiries

For any inquiry, please use the contact details provided above to contact JGK

 

 

Return of the proficiency test items

None

 

FD: Freeze-Dried