Longevity of Immunoglobulin-G Antibody Response Against Nucleocapsid Protein Against SARS-CoV-2 Among Healthcare Workers

Background

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) caused the latest pandemic and the most significant challenge in public health worldwide. Studying the longevity of naturally developed antibodies is highly important clinically and epidemiologically. This paper assesses the longevity of antibodies developed against nucleocapsid protein amongst our health-care workers.

Methods

This longitudinal cohort study was conducted at a tertiary hospital, Saudi Arabia. Anti-SARSsCoV-2 antibodies were tested among health-care workers at three-point intervals (baseline, eight weeks, and 16 weeks).

Results

Of the 648 participants, 112 (17.2%) tested positive for Coronavirus (COVID-19) by PCR before the study. Of all participants, 87 (13.4%) tested positive for anti-SARS-CoV-2 antibodies, including 17 (2.6%) participants who never tested positive for COVID-19 using rt-PCR. Out of the 87 positive IgG participants at baseline, only 12 (13.7%) had remained positive for anti-SARS-CoV-2 antibodies by the end of the study. The IgG titer showed a significant reduction in values over time, where the median time for the confirmed positive rt-PCR subgroup from infection to the last positive antibody test was 70 (95% CI: 33.4-106.5) days.

Conclusion

Health-care workers are at high risk of exposure to the SARS-CoV-2 virus, and contracting an asymptomatic infection is not unlikely. Developing and sustaining natural immunity differs from one person to another, while the rate of positive IgG anti-SARS-CoV-2 wanes over time.

Clinicaltrialsgov Identifier

NCT04469647, July 14, 2020.

A Cohort Study of Seroprevalence of Antibodies Against SARS-CoV-2 Infection Among Healthcare Workers at a Tertiary Hospital in Saudi Arabia

Background

The nature of the healthcare workers’ jobs standing at the frontline against the coronavirus disease 2019 (COVID-19) puts them at a higher risk of unknowingly contracting the disease and potentially contributing to the spread. This study aims to assess the overall positive seroconversion prevalence of SARS-CoV-2.

Methods

This is a longitudinal cohort study of healthcare workers at Johns Hopkins Aramco Healthcare (JHAH). JHAH is a tertiary hospital located in Dhahran serving patients in several districts in the Eastern Province of Saudi Arabia. Participants were recruited between June and December 2020. Each participant had a serology blood test and completed the World Health Organization’s risk factor assessment questionnaire.

Results

This study included 682 participants working in JHAH, representing 15.7% of our population. Out of the 682 participants, 15.2% had a positive SARS-CoV-2 rt-PCR before taking part in the study. However, only 87 tested positive for SARS-CoV-2 antibodies, a prevalence of 12.7% of all participants. Out of the 87 positives for SARS-CoV-2 antibodies, 17 participants never tested positive for COVID-19 rt-PCR, a prevalence of 2.9%. Moreover, not properly using alcohol-based hand rub or soap and water after the risk of body fluid exposure and wearing personal protective equipment when indicated were found to be statistically significant to having a positive SARS-CoV-2 IgG assay.

Conclusion

Positive seroconversion rate was considerably low during the first wave of COVID-19 amongst JHAH’s healthcare workers and similar to other healthcare organizations in Saudi Arabia. Seropositivity correlated significantly with following infection prevention and control recommendations.

Clinicaltrials.gov Identifier

NCT04469647.

Tawazon- An Intensive Lifestyle Diabetes Prevention Program: The Saudi Arabian Pilot

Background

Lifestyle modification interventions help prevent or postpone Type 2 Diabetes and its complications with diet modification and increasing physical activity. This is translational research of Tawazon-DPP in which we evaluate the efficacy of the intensive lifestyle modification program.

Methods

Tawazon was piloted in 2 phases over 6 and 9 months at a Tertiary Hospital. Phase I was conducted in 2017 in one district facility with 47 participants while Phase II was conducted in 2018 in 4 district facilities with 247 participants. Data are collected retrospectively in a before-and-after study design. The program included adults with 25 kg/m² BMI and HbA1c ranging between 5.7 and 6.4 mmol/L, while excluding participants with comorbidities, such as cardiovascular conditions, musculoskeletal injuries, and pregnancy.

Results

We used descriptive analysis as well as Wilcoxon rank sign test and McNemar-Bowker for before and after data comparisons. Phase I exhibited a mean age of 43±7 years and statistically significant improvement in HbA1c (0.3 mmol/L), weight (3.3 kg), BMI (1 kg/m²), triglyceride (30.4 mg/dL) and LDL (14.67 mg/dL). Phase II exhibited a mean age of 45±9 years with 70% above 40 years old. Significant improvement was also found in HbA1c (0.2 mmol/L), weight (5.1 kg), and BMI (1.8 kg/m²); the lipid profile in the second phase showed better results with significant improvement in total cholesterol (7.4 mg/dL), triglyceride (20.9 mg/dL), LDL (8.8 mg/dL), and (0.9 mg/dL) increase in HDL.

Conclusion

This pilot has taken lifestyle interventions to real-life and it led to the favored and desired outcome. It showed that long-term guided support can help patients make the needed changes in their diet, habits, and physical activity, thus, prevent or delay the onset of Type 2 diabetes.

Congenital hypomyelinating neuropathy: a reversible case

A boy was born at 39 weeks gestation with severe weakness and hypotonia, fractured femurs, poor suck and swallow, and absent deep tendon reflexes. Electrodiagnostic studies revealed marked slowing of motor nerve conduction velocities and normal muscle electrical activity with no evidence of acute denervation. Muscle biopsy showed mild type 2 fiber predominance, and sural nerve biopsy revealed large axons without myelin, and axons with insufficient amount of myelin for their diameter. There was no evidence of inflammation or demyelination. Gradual clinical improvement in tone and strength occurred in a cephalocaudal direction. By 4 months, motor nerve conduction velocities and clinical examination were normal apart from absent deep tendon reflexes. On review at 19 months, motor development and neurological examination were completely normal. Pathogenesis of this reversible pathologically documented case of congenital hypomyelinating neuropathy is unclear. No evidence was found for an inflammatory, toxic, metabolic, or demyelinating cause. Abnormal expression of a developmental gene, as in reversible cytochrome oxidase deficiency, may be a cause of this neuropathy.