A) Write in detail, special specimen collection procedures including: (a) transportation temperatures, (b) transport media and (c) preservation for the culture of: 1. Urine (5 marks) 2. Sputum (5 marks) 3. Cerebrospinal fluid (CSF) (5 marks)

Here are the special specimen collection procedures for culture:

1. Urine

   • Transportation Temperature: Transport at room temperature if processed within 2 hours. If processing is delayed, refrigerate at $2-8^\circ\text{C}$.
   • Transport Media: A sterile, leak-proof container is standard. For delays up to 24 hours, a urine transport tube containing boric acid can be used to prevent bacterial overgrowth.
   • Preservation for Culture: Refrigeration at $2-8^\circ\text{C}$ for up to 24 hours helps maintain pathogen viability and inhibits the proliferation of commensal bacteria.

2. Sputum

   • Transportation Temperature: Transport at room temperature ($20-25^\circ\text{C}$) if processed within 1-2 hours. For longer delays, refrigerate at $2-8^\circ\text{C}$.
   • Transport Media: A sterile, leak-proof container is typically sufficient for routine bacterial culture. No specialized transport media is usually required.
   • Preservation for Culture: Refrigeration at $2-8^\circ\text{C}$ for up to 24 hours is recommended to preserve the integrity of the specimen and prevent overgrowth of oral flora.

3. Cerebrospinal Fluid (CSF)

   • Transportation Temperature: CSF specimens require immediate transport to the laboratory at room temperature ($20-25^\circ\text{C}$). Refrigeration is strictly contraindicated as it can kill sensitive pathogens.
   • Transport Media: No transport media is used. CSF is collected directly into sterile tubes.
   • Preservation for Culture: The most critical preservation method is immediate processing. If a very short delay is unavoidable, the specimen should be kept at room temperature. For optimal recovery, especially if processing is delayed, CSF can be inoculated directly into a blood culture bottle.