1.0 Equipments required
Clean SS container
2.0 Material Required
Sterile SCDA plates
Sterile 70% IPA solution
3.1 Prepare SCDA medium as per SOP for preparation of culture media and aseptically pour approximately 15 – 20 ml of sterile molten cooled (40°C) SCDA agar into sterile 90 mm petri plates.
3.2 Allow to solidify the plates under LAF, after solidification label all the plates with name of media, preparation batch No. and date of preparation.
3.3 Invert and incubate the plates at 30 to 35°C for 24 hrs. After incubation check the plates for any contamination, if there is contamination discard the plates as per SOP for Destruction of Microbial waste by Autoclaving.
3.4 After pre-incubation, label all the plates with date of sampling, Personnel name and Shift with the help of marker pen and wrap with aluminium foil and then keep in clean stainless steel container
3.5 Transfer the container 1st airlock of the material entry of sterile area and personnel must be entered through airlocks (personnel entry) as per SOP for Entry and gowning procedure for sterile area.
3.6 Collect the materials from 1st airlock of the material entry of sterile area and disinfect the container with sterile 70% IPA solution.
3.7 Call operator or personnel to be monitored, open the plate and tell personnel to place his/her right hand fingers with gloves gently on the surface of SCDA plate. Use fresh plate for left hand finger and follow the same procedure.
3.8 Close the plate and follow the same procedure for minimum two persons.
3.9 Immediately, disinfect the fingers with sterile 70% IPA solution and ask operator to go to change room and replace with fresh sterile gloves and gown.
3.10 Prepare a positive control plate by streaking any pure culture of E. coli / Salmonella / Staph. aureus/ Ps. aeruginosa, on the surface of SCDA plate. For negative control, incubate the plate as it is without streaking.
3.11 Invert, and incubate all the plates at 20-25°C for 72 hrs and 30 to 35°C for 48 hours.
3.12 After incubation, count the number of cfu formed on the plates with the help of colony counter. Operate as per SOP for colony counter and record the results per 5 finger.
4.1 Maintain aseptic condition during testing
4.2 After finger dab testing, immediately wash the hands with sterile 70% IPA solution.
4.3 Result must be expressed per five finger
4.4 All pre-incubated plates should be rejected if a single plate shows evidence of microbial contamination.
SCDA : Soyabean Casein Digest Agar
IPA : Isopropyl Alcohol
Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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