A hospital trust investigated the efficacy of two sanitisation protocols on high-touch surfaces in clinical wards.

In Ward Block A, researchers implemented Protocol Alpha (Automated UV-C Light Treatment), while in Ward Block B, they implemented Protocol Beta (Manual Chemical Deep Cleaning). The mean microbial load, measured in colony-forming units per square centimetre ( $CFU/cm2\text{CFU/cm}^2$ ), was recorded 24 hours after the treatments.

Table 1: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 24 hours after sanitisation

Protocol Alpha (UV-C Light)	Protocol Beta (Manual Chemical)
12	8

To evaluate the long-term durability of the sanitisation, the researchers returned 14 days later to measure the mean microbial load on the same surfaces. During this 14-day period, both ward blocks only received standard daily maintenance cleaning.

Table 2: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 14 days after sanitisation

Protocol Alpha (UV-C Light)	Protocol Beta (Manual Chemical)
18	95

The clinical director reviewed the data from both Table 1 and Table 2.

A hospital trust investigated the efficacy of two sanitisation protocols on high-touch surfaces in clinical wards.

Table 1: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 24 hours after sanitisation

Protocol Alpha (UV-C Light)	Protocol Beta (Manual Chemical)
12	8

Table 2: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 14 days after sanitisation

Protocol Alpha (UV-C Light)	Protocol Beta (Manual Chemical)
18	95

The clinical director reviewed the data from both Table 1 and Table 2.

Data handling and analysis

Question 35

Table 1: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 24 hours after sanitisation

Table 2: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 14 days after sanitisation

Markscheme

Data handling and analysis

Question 35

Table 1: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 24 hours after sanitisation

Table 2: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 14 days after sanitisation

Markscheme

Data handling and analysis

Question 35

Table 1: Mean microbial load (CFU/cm2\text{CFU/cm}^2CFU/cm2) 24 hours after sanitisation

Table 2: Mean microbial load (CFU/cm2\text{CFU/cm}^2CFU/cm2) 14 days after sanitisation

Data handling and analysis Questions

Data handling and analysis

Question 35

Table 1: Mean microbial load (CFU/cm2\text{CFU/cm}^2CFU/cm2) 24 hours after sanitisation

Table 2: Mean microbial load (CFU/cm2\text{CFU/cm}^2CFU/cm2) 14 days after sanitisation

Data handling and analysis Questions

Table 1: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 24 hours after sanitisation

Table 2: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 14 days after sanitisation

Table 1: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 24 hours after sanitisation

Table 2: Mean microbial load ( $CFU/cm2\text{CFU/cm}^2$ ) 14 days after sanitisation