Benefits of integrated screening and vaccination for infection control

Leveraging Walnut Somatic Embryos as a Biomanufacturing Platform for Recombinant Proteins and Metabolites

Biomanufacturing enables novel sources of compounds with constant demand, such as food coloring and preservatives, as well as new compounds with peak demand, such as diagnostics and vaccines. The COVID-19 pandemic has highlighted the need for alternative sources of research materials, thrusting research on diversification of biomanufacturing platforms. Here, we show initial results exploring the walnut somatic embryogenic system expressing the recombinant receptor binding domain (RBD) and ectodomain of the spike protein (Spike) from the SARS-CoV-2 virus. Stably transformed walnut embryo lines were selected and propagated in vitro. Both recombinant proteins were detected at 3-14 µg/g dry weight of tissue culture material. Although higher yields of recombinant protein have been obtained using more conventional biomanufacturing platforms, we also report on the production of the red pigment betanin in somatic embryos, reaching yields of 650 mg/g, even higher than red beet Beta vulgaris. This first iteration shows the potential of biomanufacturing using somatic walnut embryos that can now be further optimized for different applications sourcing specialized proteins and metabolites.

Incorporating social determinants of health into transmission modeling of COVID-19 vaccine in the US: a scoping review

During COVID-19 in the US, social determinants of health (SDH) have driven health disparities. However, the use of SDH in COVID-19 vaccine modeling is unclear. This review aimed to summarize the current landscape of incorporating SDH into COVID-19 vaccine transmission modeling in the US. Medline and Embase were searched up to October 2022. We included studies that used transmission modeling to assess the effects of COVID-19 vaccine strategies in the US. Studies' characteristics, factors incorporated into models, and approaches to incorporate these factors were extracted. Ninety-two studies were included. Of these, 11 studies incorporated SDH factors (alone or combined with demographic factors). Various sets of SDH factors were integrated, with occupation being the most common (8 studies), followed by geographical location (5 studies). The results show that few studies incorporate SDHs into their models, highlighting the need for research on SDH impact and approaches to incorporating SDH into modeling.

Funding

This research was funded by the Centers for Disease Control and Prevention (CDC).

Effective screening strategies for safe opening of universities under Omicron and Delta variants of COVID-19

As new COVID-19 variants emerge, and disease and population characteristics change, screening strategies may also need to change. We develop a decision-making model that can assist a college to determine an optimal screening strategy based on their characteristics and resources, considering COVID-19 infections/hospitalizations/deaths; peak daily hospitalizations; and the tests required. We also use this tool to generate screening guidelines for the safe opening of college campuses. Our compartmental model simulates disease spread on a hypothetical college campus under co-circulating variants with different disease dynamics, considering: (i) the heterogeneity in disease transmission and outcomes for faculty/staff and students based on vaccination status and level of natural immunity; and (ii) variant- and dose-dependent vaccine efficacy. Using the Spring 2022 academic semester as a case study, we study routine screening strategies, and find that screening the faculty/staff less frequently than the students, and/or the boosted and vaccinated less frequently than the unvaccinated, may avert a higher number of infections per test, compared to universal screening of the entire population at a common frequency. We also discuss key policy issues, including the need to revisit the mitigation objective over time, effective strategies that are informed by booster coverage, and if and when screening alone can compensate for low booster coverage.

Cervical cancer knowledge, awareness and related health behaviours amongst women of reproductive age in Kiambu County, Kenya: a cross-sectional study

Background

Data on cervical cancer knowledge, perceptions, screening practices and other relevant health behaviours among women in rural Kenya is limited. Yet understanding this information is a key first step in developing evidence-based interventions aimed at addressing the low uptake of screening services and heavy cervical cancer disease burden within Kenya. Consequently, our study sought to assess cervical cancer knowledge, attitude, and practice amongst women of reproductive age within Kiambu County, known for a high cervical cancer disease burden.

Methods

This was an analytical cross-sectional study undertaken in April 2022. Data was collected using interviewer-administered questionnaires from 472 females randomly selected from within the community. Data analysis included descriptive statistics (mean values, standard deviations, and frequencies) and logistic regression, using STATA version 13.

Results

More than 80% of respondents were aware of cervical cancer though only 54% answered at least half of the knowledge questions correctly. Knowledge of HPV was particularly low, likely because 55% of the study sample stated they had never heard of HPV. Though 89% of study participants deemed cervical cancer preventable, more than 60% had an unfavourable attitude towards cervical cancer screening, deeming the process expensive, painful, and embarrassing. In line with the latter observation, only 20% of our sample had ever been screened for cervical cancer and less than half of this group had undergone regular screening. Notably, knowing a place where cervical cancer screening services are provided had the largest increase in odds of being screened (3.94; 95% CI: 1.08-14.37). Fear of tests and outcomes was also noted to be a prime concern amongst our study participants.

Conclusion

A clear message from this study is the need to ensure community members are aware of where to access screening services and strategies are implemented to address prevalent fears and negative perceptions.Abbreviations: CHV: Community Health Volunteers; HPV: Human papillomavirus; HIV/AIDS: Human immunodeficiency virus/Acquired immune deficiency syndrome; LEEP: Loop Electrosurgical Excision Procedure; LMICs: Low- and Middle-Income Countries; NCI: National Cancer Institute; NACOSTI: National Commission for Science, Technology, and Innovation; VIA: Visual inspection with acetic acid; VILLI: Visual inspection with Lugol's iodine; WHO: World Health Organisation.