Water quality in the dental unit waterlines (DUWLs) is important to the patients and dental health care personnel as they are at risk of being infected with opportunistic pathogens such as Pseudomonas or Legionella species. In this study, a total of 86 samples were collected from DUWLs of 19 dental units in 11 Malaysian Armed Forces dental centres (MAFDC). 350 ml water sample was collected in sterile thiosulphite bags from the outlets of 3–way syringe, high speed handpiece, scaler, cup filler, independent water reservoir or the tap of the same surgery respectively. Samples were transported to the laboratory within 24 hours and kept in the refrigerator at 40C. 100ml of each sample was filtered through a 0.45 μm polycarbonate membrane filter. The filter was then inoculated onto plate count agar and incubated at 370 C for 24 hours, after which the formed colonies were enumerated. Another separate 100ml of water sample was poured onto buffered charcoal yeast extract agar and cetrimide agar to culture Legionnella and Pseudomonas respectively. Identification of these bacteria were confirmed by polymerase chain reaction and sequencing. Pseudomonas aeruginosa was detected in 9.5% of the samples but Legionnella was not detected in any of the samples. 77% of the samples met American Dental Association (ADA) recommendation of less than 200 cfu/ml. The result of this study showed that it is difficult if not impossible to eliminate biofilm from the DUWLs. Regular monitor of water quality from DUWL is required to maximise the health of the dental patients and dental health care personnel.

Introduction: To combat the COVID-19 pandemic, Malaysia started vaccination of front-liners and adults in the community. The latter group might have insufficient knowledge to accept COVID-19 vaccination, therefore this research was to assess the knowledge and acceptance of COVID-19 vaccination among youths, specifically students in a Malaysian college. Methods: A cross-sectional study was conducted among 481 foundation students in Kolej MARA Kulim (KMKU). The minimum sample size, using Epi Info was 214. Students answered an online questionnaire using google form which included demographic data (age, gender) and ten questions on knowledge and acceptance of COVID-19 vaccination. For knowledge questions, students answered “yes”, “no” or “don’t know”, correct answer scoring 1. For acceptance questions, a 5-point Likert scale was used ranging from “strongly disagree” to “strongly agree”. EXCEL and SPSS version 23 were used for analysis with Chi-square test done to test association (significant for p-value <0.05). Results: The response rate was 65.1% with 313 students, (45.4% males, and 54.6% females) aged 18-19 years. The majority (83.7%) had satisfactory to excellent knowledge scores (mean = 6.66 (SD=2.299, 95% CI 6.40-6.91), median = 7 (± IQR =3), while 16.3% obtained poor scores (≤ 4). The majority (90%) accepted vaccination. Higher knowledge scores were associated with higher acceptance rates in both genders (p-value= 0.000). Significantly more females (90.6%) than males (80.3%) had positive attitude towards vaccination (p-value = 0.009). Conclusions: The majority of the foundation students in KMKU were knowledgeable on COVID-19 vaccination and willing to receive the vaccination against the novel coronavirus.