COVID-19 vaccine breakthrough infection among health care workers at MODHS hospitals in Saudi Arabia: A multicenter study.

BACKGROUND: We investigated the clinical manifestation and severity of COVID-19 infection represented as a composite outcome (hospital or ICU admission, or in-hospital death) among infected fully vaccinated HCWs, the RT-PCR test Ct value (Cycle Threshold) of positive fully vaccinated HCWs, and we measure the interval from the second vaccine to acquiring the infection. METHODS: A multicenter retrospective cohort study was conducted in different regions at (16) Ministry of Defense Health Services (MODHS) hospitals. Data were restricted to fully vaccinated (minimum of 2 doses) HCWs who had a confirmed positive PCR test and employed in MODHS hospitals from August 2021 to March 2022. RESULTS: A total of 45862 HCWs were vaccinated as of Aug 2021. Of these 1253 participants met the selection criteria and were included in the study. The average age of infected HCWs was 35.27 years (SD = ± 8.10) of which 57% were females. The HCWs were employed as doctors (24%), nurses (33%), and other (43%). The most administered vaccine type was mRNA (44%) followed by Adenovirus Viral Vector (39%) and mixed vaccine (17%). The incidence of COVID-19 vaccine breakthrough (BT) infection among HCWs was observed at 2.73% (m-RNA 3.19%, Viral Vector 2.83% and mixed 1.87%). CONCLUSION: the overall COVID-19 (BT) infection incidence proportion was (2.73%), with the Mixed vaccine group showing the lowest (BT) incidence proportion (1.87%). The most commonly reported symptoms among (BT) infections were cough (51%), sore throat (51%), fever (47%), headache (31%), and runny nose (23%), with overall (6%) asymptomatic (BT) infections. We had (1%) hospital admissions, Zero ICU admission, and Zero deaths. our finding may indicate that infection affecting fully vaccinated patients were less severe and mostly affected the upper respiratory tract.

Anti-tubercular activity evaluation of natural compounds by targeting Mycobacterium tuberculosis resuscitation promoting factor B inhibition: An in silico study.

Tuberculosis (TB), an infectious disease caused by the Mycobacterium tuberculosis (Mtb), has been responsible for the deaths of millions of individuals around the globe. A vital protein in viral pathogenesis known as resuscitation promoting factor (RpfB) has been identified as a potential therapeutic target of anti-tuberculosis drugs. This study offered an in silico process to examine possible RpfB inhibitors employing a computational drug design pipeline. In this study, a total of 1228 phytomolecules were virtually tested against the RpfB of Mtb. These phytomolecules were sourced from the NP-lib database of the MTi-OpenScreen server, and five top hits (ZINC000044404209, ZINC000059779788, ZINC000001562130, ZINC000014766825, and ZINC000043552589) were prioritized for compute intensive docking with dock score ≤ - 8.5 kcal/mole. Later, molecular dynamics (MD) simulation and principal component analysis (PCA) were used to validate these top five hits. In the list of these top five hits, the ligands ZINC000044404209, ZINC000059779788, and ZINC000043552589 showed hydrogen bond formation with the functional residue Glu292 of the RpfB protein suggesting biological significance of the binding. The RMSD study showed stable protein-ligand complexes and higher conformational consistency for the ligands ZINC000014766825, and ZINC000043552589 with RMSD 3-4 Å during 100 ns MD simulation. The overall analysis performed in the study suggested promising binding of these compounds with the RpfB protein of the Mtb at its functional site, further experimental investigation is needed to validate the computational finding.

Possible vertical transmission of corona virus disease 19 (COVID-19) from infected pregnant mothers to neonates: a multicenter study.

INTRODUCTION: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is highly contagious with various possible routes of transmission, resulting in high mortality globally. Controversy exists regarding the vertical transmission of the SARS-CoV-2 infection to fetuses of COVID-19-infected women. The aim of this study was to investigate the possibility of the vertical transmission of SARS-CoV-2 from COVID-19-infected mothers to their neonates. MATERIALS AND METHODS: We prospectively collected demographical and clinical characteristics of 31 COVID-19 positive pregnant women and their neonates. All mothers and neonates were tested for SARS-CoV-2 infection using the real-time polymerase chain reaction on nasopharyngeal swabs and breast milk samples. Antenatal and placental abnormalities were ultrasonically and histopathologically examined. In cord blood samples, the immunoglobins (Ig) M and IgG were estimated qualitatively. RESULTS: The women's mean age and gestational age were 31 years and 38 weeks, respectively, with 58% undergoing an elective cesarean section. Gestational diabetes was reported in 29% of cases, 64.5% of women were medically free and only 16.12% were symptomatic. A normal antenatal ultrasound was observed in 77.42% of cases. Nine cord blood samples were positive for IgG. Villous infarction (24%), villous agglutination, and chorangiosis (51%), accelerated villous maturation (21%) and reduced and hypercoiling were reported for 6.97% of the umbilical cords. Three newborns had possible vertical transmission of SARS-CoV-2 infection, of which, two were preterm and IUFD. The third neonate was born full-term, admitted to NICU and later discharged in good health. CONCLUSION: Our findings support the possibility of the direct vertical transmission of the SARS-CoV-2 infection to neonates from infected mothers. Further studies with a larger sample size are required to validate the current findings.

SARS-CoV-2 seroprevalence among healthcare workers from a tertiary care center in Riyadh, Saudi Arabia.

OBJECTIVES: To calculate the seroprevalence of asymptomatic healthcare workers (HCWs) in our institution. METHODS: We conducted a cross-sectional study among asymptomatic HCWs in a large hospital during the peak of the pandemic (from July to August 2020 and followed them up until February 2021) in Riyadh, Saudi Arabia. We collected the data in a Microsoft Word document after collecting a single serum sample for detection of antibodies from each participant then we compared the results statically in Microsoft Excel tables. RESULTS: We enrolled 188 participants and measured their IgG antibodies from venous blood samples using CLIA. Six (3.2%) had positive antibodies despite being asymptomatic. Most of these were from non-COVID-19 working areas (4 out of 6), but all had an exposure with a positive COVID-19 patient at some point in the preceding 2 months. CONCLUSIONS: Our results are consistent with similar local studies showing low seroprevalence among HCWs while most positive cases are from non-COVID-19 areas. Despite this low seroprevalence, HCWs are still considered a high-risk group; hence, there is a need to encourage strict implementation and adherence to infection control measures and vaccination among HCWs, especially when these measures are relaxed on the national level.

A retrospective study of tuberculosis prevalence amongst patients attending a tertiary hospital in Riyadh, Saudi Arabia.

Tuberculosis (TB) is a public health challenge that affects all genders and age groups and is a single leading infectious disease killer globally. We retrospectively investigated the prevalence of TB and anti-TB drug resistance among patients treated at the Prince Sultan Military Medical City (PSMMC) between the years 2000 and 2017. Patient demographic variables and drug susceptibility test results were obtained from TB notification records located in the TB laboratory at PSMMC. A total of 58,141 records were reviewed of which 1123 (2%) specimens were positive for Mycobacterium tuberculosis. Of the positive, 621 (55%) were from pulmonary specimens. Males over the age of 15 years accounted for 60% of the positive specimens. Drug resistance to at least one drug was detected in 90 (8%) of which 60 (5.3%), 24 (2%) 6 (0.5%) patients were mono-drug-resistant, poly-drug resistant and multidrug resistant (MDR-TB) respectively. Resistance to isoniazid and streptomycin were the most frequently found among first-line tuberculosis drugs, accounting for 4.5% and 3.8% of drug resistance cases respectively. Our findings show low prevalence of tuberculosis and multidrug resistant TB among patients treated at PSMMC over a 17-year period. Nationwide assessment is needed to get a clear picture of the TB burden across Saudi Arabia and inform national policies for eradication of TB.