1.Distribution of virulence genes in clinical isolates of hospital-associated and community-associated methicillin-susceptible Staphylococcus aureus from Terengganu, Malaysia
Che Hamzah, A.M. ; Yeo, C.C. ; Puah, S.M. ; Chua, K.H. ; A. Rahman, N.I. ; Ismail, S. ; Abdullah, F.H. ; Othman, N. ; Chew, C.H.
Tropical Biomedicine 2024;41(No.2):149-156
Staphylococcus aureus is a common bacterial pathogen known to cause various kinds of infections due to
its repertoire of virulence factors. This study aimed to investigate the distribution of 19 types of virulence
genes among clinical isolates of methicillin-susceptible S. aureus (MSSA) using the polymerase chain
reaction. A total of 109 MSSA isolates, i.e., 63 hospital-associated (HA) and 46 community-associated (CA)
were collected from Hospital Sultanah Nur Zahirah, the main tertiary hospital in Terengganu, Malaysia,
from July 2016 to June 2017. The most frequent virulence genes detected were hla (78.9%, n=86) and
hld (78.0%, n=85) encoding hemolysins, lukED (56.9%, n=62) encoding leukotoxin ED, followed by seb
(26.6%, n=29) and sea (24.8%, n=27) encoding enterotoxins. Among 34 (31.2%) isolates carrying six
or more virulence genes, only five were multidrug resistant (MDR) while the remaining isolates were
susceptible. Significant associations were discovered between the hld gene with CA-MSSA (p=0.016) and
the seo gene with HA-MSSA (p=0.023). However, there is no significant association between virulence
genes among the different types of infection. The clinical MSSA isolates in Terengganu showed high
prevalence and high diversity of virulence gene carriage.
2.Phylogenetic Relationships of the Mutualistic Fungi Associated with Macrotermes subhyalinus in Oman
Hilal S. ALSHAMAKHI ; Abdullah M. AL-SADI ; Lyn G. COOK
Mycobiology 2023;51(5):281-287
The symbiotic association between fungus-gardening termites Macrotermes and its fungal symbiont has a moderate degree of specificity—although the symbiotic fungi (Termitomyces) form a monophyletic clade, there is not a one-to-one association between termite species and their fungus-garden associates. Here, we aim to determine the origin and phylogenetic relationships of Termitomyces in Oman. We used sequences of the internal transcribed spacer region (ITS) and the nuclear large subunit ribosomal RNA (LSU rRNA, 25S) gene and analyzed these with sequences of Termitomyces from other geographic areas. We find no evidence for more than a single colonization of Oman by Termitomyces. Unexpectedly, we find Termitomyces in Oman is most closely related to the symbiont of M. subhyalinus in West Africa rather than to those of geographically closer populations in East Africa.
3.Zika virus antibody-positivity among symptomatic/asymptomatic pregnant women in the Aseer region displays pre-exposure to dengue viruses
Harish, C.C. ; Ayed, A.A. ; Alhanshani, A.A. ; Youssef, A.A. ; Esther, P. ; Riyad, A.A.M. ; Abdullah, M.A. ; Anandalakshmi, S. ; Ashish, K. ; Ahmed, M.A.H.
Tropical Biomedicine 2023;40(No.3):337-343
Antibody cross-reactivity among flaviviruses is a major limitation in understanding the prevalence
without vector control measures. In this study, we investigated the presence of Zika virus (ZIKV)-specific
antibodies and the significance of their cross-reactivity with other flaviviruses, which could affect the
serological specificity in both symptomatic and asymptomatic pregnant women. Among the results
obtained from 217 serum samples tested for ZIKV-specific IgM and IgG, no specific predictions regarding
seropositivity or exposure due to extensive cross-reactivity with dengue virus (DENV) serology could be
made. Clear-cut positivity was observed in 1.8% (n = 4) and 1.0% (n = 2) for ZIKV IgM and IgG, respectively.
The same samples assessed for DENV showed 1.3% (n = 3) seropositivity each for IgM and IgG levels.
None of the samples were positive for ZIKV and DENV IgM or IgG. However, one sample (0.4%) tested
positive for ZIKV and DENV IgM. No significant correlation was observed between DENV IgM and IgG
when comparing the overlapped serotiters. On the other hand, the ZIKV IgG-positive sample showed
higher serotiters for DENV IgG, indicating cross-reactivity with ZIKV but without statistical significance.
Therefore, screening for the incidence of ZIKV becomes particularly challenging in a population where
the presence or pre-exposure to DENV is observed. Our observations further suggest that unless
flavivirus prevalence is properly addressed, determining the prevalence of ZIKV antibodies, which may
be confounded with other uninvestigated flaviviruses, will be complicated.
4.Assessment of skipping breakfast at home among adolescent school students in Badia Region, Jordan
Amani Masalha ; Mohammad S ALBashtawy ; Mohammad N Alshloul ; Nisren Abu Baker ; Shereen Hamadneh ; Abdullah Alkhawaldeh ; Mohammed S Alyahya ; Ma&rsquo ; en Aljezawi ; Asem Abdalrahim ; Mohammad Suliman ; Doha M Alshloul
Malaysian Journal of Nutrition 2023;29(No.2):343-354
Introduction: Healthy meals play an essential role in the healthy physical and
mental development of adolescents. Breakfast at home is associated with improved
nutritional choices, and skipping breakfast is detrimental. This study assessed
prevalence of skipping breakfast at home among adolescent students in the Badia
Region of Jordan, identifying the reasons and characteristics associated with
such behavioural choice. Methods: A cross-sectional survey among adolescent
students (aged 13-16 years, in 8th-9th grades) from six public schools in Badia
Region, Mafraq Governorate, Jordan, was conducted through self-administered
questionnaire from February to March 2022. Results: Results showed that 68.1%
of 552 student participants regularly skipped breakfast at home (72.4% boys vs.
61.3% girls; p=0.007). Among those who regularly skipped breakfast, three main
rationales for this choice were not feeling hungry (5.3%), lack of time (2.7%), and
lack of appetite (3.5%). Conclusion: The prevalence of skipping breakfast at home
among adolescents in Badia Region was high for various reasons, including lack
of time, not feeling hungry, seeking to manage weight, and insufficient knowledge
on the importance of healthy breakfast. Therefore, understanding the reasons and
factors that contribute towards breakfast skipping may help in solving the problem,
underscoring that positive beliefs should be reinforced in schools, with parents
encouraging adolescents to eat healthy breakfast.
5.Antibacterial and antibiotic potentiating capabilities of extracts isolated from Burkillanthus malaccensis, Diospyros hasseltii and Cleisthanthus bracteosus against human pathogenic bacteria
Kathirvalu, G. ; Chandramathi, S. ; Azahar, S.A. ; Atiya, N. ; Begum, S. ; Christophe, W. ; Sulaiman, M. ; Abdullah, N. ; Mani, R.R. ; Jindal, H.M. ; Zulkipli, M.
Tropical Biomedicine 2023;40(No.2):152-159
Antibiotics which once a boon in medicine and saved millions of lives are now facing an ever-growing
menace of antibacterial resistance, which desperately needs new antibacterial drugs which are innovative
in chemistry and mode of action. For many years, the world has turned to natural plants with antibacterial
properties to combat antibiotic resistance. On that basis, we aimed to identify plants with antibacterial
and antibiotic potentiating properties. Seventeen different extracts of 3 plants namely Burkillanthus
malaccensis, Diospyros hasseltii and Cleisthanthus bracteosus were tested against multi-drug resistant
Acinetobacter baumannii, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Methicillinresistant Staphylococcus aureus (MRSA) and methicillin-susceptible Staphylococcus aureus (MSSA).
Antibacterial activity of hexane, methanol and chloroform extracts of bark, seed, fruit, flesh and leaves
from these plants were tested using, disk diffusion assay, minimum inhibitory concentration (MIC) and
minimum bactericidal concentration (MBC) assays. Antibiotic potentiating capabilities were tested using
time-kill assay. B. malaccensis fruit chloroform extract showed the biggest zone of inhibition against MRSA
(13.00±0.0 mm) but C. bracteosus bark methanol extract showed the biggest inhibition zone against
MSSA (15.33±0.6 mm). Interestingly, bark methanol extract of C. bracteosus was active against MRSA
(8.7±0.6 mm), MSSA (7.7±0.6 mm) (Gram-positive) and A. baumannii (7.7±0.6 mm) (Gram-negative).
Overall, the leaf methanol and bark methanol extract of C. bracteosus warrants further investigation
such as compound isolation and mechanism of action for validating its therapeutic use as antibiotic
potentiator importantly against MRSA and A. baumannii.
6.Genetic diversity of Duffy binding protein 2 region II of Plasmodium cynomolgi from wild macaques in Peninsular Malaysia
Latif, E.N.M. ; Shahari, S. ; Amir, A. ; Cheong, F.W. ; Lau, Y.L. ; Abdullah, M.L. ; Fong, M.Y.
Tropical Biomedicine 2022;39(No.1):66-72
Recent reports of natural human infection by Plasmodium cynomolgi indicate the increased
risk of zoonotic transmission by this simian parasite. The P. cynomolgi Duffy binding protein
2 (PcDBP2) has a potential role in the invasion pathway of host erythrocytes, and it is a
possible vaccine candidate against cynomolgi malaria. This study investigates the genetic
diversity, haplotypes, and natural selection of PcDBP2 region II from isolates collected from
wild macaques in Peninsular Malaysia. Blood samples from 50 P. cynomolgi-infected wild
macaques were used in the study. Genomic DNA extracted from the blood samples was used
as template for PCR amplification of the PcDBP2 region II. The amplicons were cloned into a
plasmid vector and sequenced. MEGA X and DnaSP ver.6.12.03 programmes were used to
analyse the DNA sequences. A genealogical relationship of PcDBP2 region II were determined
using haplotype network tree on NETWORK ver.10.2. Result showed high genetic diversity (ð
= 0.017 ± 0.002; Hd = 1.000 ± 0.001) of the PcDBP2 region II. The Z-test indicates a purifying
selection, with population expansion as shown in Tajima’s D analysis. A total of 146
haplotypes of PcDBP2 region II were observed. Phylogenetic tree analysis showed that these
haplotypes were grouped into three allelic types (136 for Strain B type, 9 for Berok type, and
1 recombinant type). In the haplotype network, PcDBP2 region II revealed no geographical
groupings but was divided into two distinct clusters.
7.The impact of ipsilateral testicular atrophy on semen quality and sperm DNA fragmentation response to varicocele repair.
Parviz K KAVOUSSI ; Natasha ABDULLAH ; Melissa S GILKEY ; Caitlin HUNN ; G Luke MACHEN ; Shu-Hung CHEN ; Keikhosrow M KAVOUSSI ; Amy ESQUEDA ; J David WININGER ; Shahryar K KAVOUSSI
Asian Journal of Andrology 2021;23(2):146-149
Varicoceles adversely impact semen quality and sperm DNA fragmentation, which typically improve with surgical repair. Some men with varicoceles have ipsilateral testicular atrophy due to damage from the varicocele. This study assessed semen quality and the sperm DNA fragmentation index (DFI) response to varicocele repair in men with ipsilateral testicular atrophy (TA) versus men with no testicular atrophy (NTA). Semen parameter values and DFI in both groups were compared preoperatively and postoperatively. The Mann-Whitney U test and the Wilcoxon signed-rank test were used where appropriate. There were 20 men in the TA group and 121 men in the NTA group with no difference in age, varicocele grade, or preoperative semen parameter values between the two groups. The NTA group had a higher preoperative DFI than the TA group. Both groups showed improvement in semen quality postoperatively, only the TA group showed a significant improvement in DFI, whereas the NTA group showed significant improvements in several parameter values and DFI. The change from preoperative to postoperative parameter values when comparing the two groups revealed a difference in total sperm motile count and DFI, with a larger mean improvement in the NTA group than in the TA group. Both TA and NTA groups showed improved semen quality and DFI after varicocele repair, but the NTA group had more improvement than the TA group. However, only total motile count (TMC) and DFI had a significantly greater mean change in preoperative to postoperative response in the NTA group than in the TA group.
8.A Review of Surgically Treated Distal Radius Fractures in a University Hospital
Bahar-Moni AS ; Wong SK ; Mohd-Shariff N ; Sapuan J ; Abdullah S
Malaysian Orthopaedic Journal 2021;15(No.3):52-57
Introduction: Distal radius fracture (DRF) is the most
common orthopaedic injury with a reported incidence of
17.5%. It is commonly seen in young males and elderly
females. Over the last two decades, there is an increasing
tendency to treat DRF surgically by open reduction and
internal fixation (ORIF) with plate and screws owing to
improved device design, better fixation and operative
technique. The purpose of this study was to evaluate the
demographic characteristics, type and method of fixation,
and outcome in all surgically treated DRF cases from 2014
to 2018 in a university hospital.
Materials and methods: A retrospective review of all
surgically treated DRF cases with one year follow-up in a
tertiary hospital in Malaysia was done. Patients who left the
follow-up clinic before one-year post-surgery or before
fracture union were excluded. A total of 82 patients with 88
DRF were finally included into the study and outcome in
terms of union time and need of multiple surgeries were
analysed along with the predictors.
Results: In this study, mean age of the patient was 46.2
years. Motor vehicle accident was the commonest cause of
the fracture and AO Type C fracture was the commonest
fracture type. Seventeen (19.3%) out of 88 fractures were
compound fracture. Open reduction and internal fixation
with volar plate was the most common surgical technique
done in this series (93.2%). Three (3.5%) out of 88 fractures
required multiple surgeries and eighty-three (94.3%) DRF
cases were united before nine months of the surgery in this
study. There was statistically significant association between
clinical type of the fracture and the union time (p-value
<0.05).
Conclusion: There was a 1.7:1 male-female ratio with AOC fracture being the most common type of fracture. The most
common method of fixation was ORIF with volar locked
plate. Patients with closed fractures have a higher rate of
union compared to open fractures at nine months.
9.Epidemiology and Factors Affecting Functional Outcome of Distal Radial Fracture in an Urban Tertiary Medical Centre in Malaysia
Chao WQ ; Azman MZ ; Rosdi SA ; Tuan-Mustafa TAW ; Tan YJ ; Abdullah S ; Aizuddin AN
Malaysian Orthopaedic Journal 2021;15(No.3):84-90
Introduction: Distal radial fracture is a commonly
encountered fracture. This study aims to study the
epidemiology of distal radial fracture and factors affecting
the patients’ functional outcome one to two years after the
injury.
Materials and methods: This is a retrospective cohort
study. The records of patients, fulfilling the radiographical
diagnosis of distal radial fracture, and aged 18 and above,
who presented to our Emergency Department from 1st
January 2018 to 31st December 2018 were retrieved.
According to AO classification, we grouped our patients into
A (extra-articular), B (partial articular) and C (complete
articular). Patients with congenital abnormalities were
excluded. Epidemiological data and relevant medical history
were obtained and tabulated. A Malaysian language
translation of Disability of the Arm, Shoulder and Hand
(DASH) questionnaire was used to assess the functional
outcome.
Results: Out of 168 patients’ data retrieved, only 110
patients’ data were found complete for purposes of this study.
The mean DASH score was 13.7 ± 7.87 approximately one
to two years post-injury regardless of treatment method.
Increasing age was associated with higher DASH score with
r=0.407(p<0.001). Several variables had significantly better
functional outcome: male gender (p=0.01), Type A fracture
configuration (p=0.007) and non-operational treatment
(p=0.03). There was no significant difference between
treatment modalities in Type A fracture (p=0.094), but
Type B (p=0.043) and Type C (p=0.007) had better outcome
without surgery. There was no significant difference between
different ethnic groups, open or closed fracture and
mechanism of injury.
Conclusion: Better functional outcome after sustaining
distal radial fracture was associated with young age, male
gender, type A fracture and treated non-operatively.
Interestingly, more complex fracture pattern had better
functionality were observed without surgery.
10.Opposite Modulatory Effects of Crataegus aronia Aqueous Extract on Platelet Aggregation in Rats.
Abdullah S SHATOOR ; Ali SHATI ; S Al HUMAYED ; Sultan AL-QAHTANI ; Mahmoud ALKHATEEB
Chinese journal of integrative medicine 2021;27(9):696-704
OBJECTIVES:
To reveal the mechanisms behind the dual effects of Crataegus aronia (C. aronia) aqueous extract on platelet aggregation by focusing on function, regulation, expression, and signaling of platelets P
METHODS:
Adult male Wistar rats (120 ± 10 g) were classified as control received the vehicle, C. aronia (200 mg/kg), and C. aronia (2,000 mg/kg)-treated rats. After treatments for consecutive 7 days, hematological and molecular experiments were conducted to detect alterations in platelet aggregation, thromboxane B2 (THXB2) and intracellular reactive oxygen species (ROS) content; protein levels of P
RESULTS:
At a concentration of 200 mg/kg, C. aronia inhibited platelet aggregation through multiple interconnected mechanisms including downregulation P
CONCLUSION
Oral administration of C. aronia at low dose inhibits platelet aggregation by reducing THXB2 release, expression of P-selectin and activating cAMP and Akt signaling through two major mechanisms including downregulation of P


Result Analysis
Print
Save
E-mail