Role of super-spreader phenomenon in a Covid-19 cluster among healthcare workers in a Primary Care Hospital

A dynamic model for elevator operation-induced spread of a respiratory infectious disease in an apartment building

Residents have to use elevators to leave and enter their high-rise apartments frequently. An elevator car can easily spread respiratory infectious diseases, as it has a confined and small space. Therefore, studying how elevator operations promote epidemic transmission is of importance to public health. We developed an infectious disease dynamics model. First, we used homemade codes to simulate the operating state of an elevator and the dynamic process of infectious disease transmission in an apartment building due to elevator operations. Second, we analysed the temporal distribution patterns of infected individuals and patients. Finally, we validated the reliability of the model by performing continuous-time sensitivity analysis on important model parameters. We found that elevator operations can cause rapid spread of infectious diseases within an apartment building. Therefore, it is necessary to enhance elevator ventilation and disinfection mechanisms to prevent the outbreak of respiratory infections. Moreover, residents should reduce elevator use and wear masks.

Understanding the Pathways from Mindfulness to COVID-19 Vaccination Intention via Positive Psychology Attributes among Health Care Workers in China

OBJECTIVE

The present study aims to examine the association between mindfulness and COVID-19 vaccination intention, and the mediating role of presence of meaning in life and moral elevation in such association.

METHOD

In a cross-sectional study design, a total of 1733 health care workers (81.1% females, M_age = 34.16 ± 9.03) from four cities in China were recruited and completed an online survey that measured mindfulness, moral elevation, presence of meaning in life and COVID-19 vaccination intention.

RESULTS

It has been found that 73.1% of the participants reported an intention to receive COVID-19 vaccination. Mindfulness was positively associated with COVID-19 vaccination intention; Mediation analyses using structural equation modeling showed a significant indirect effect of mindfulness on COVID-19 vaccination intention, accounting for 42.4% of the total effect. Mindfulness was positively associated with COVID-19 vaccination intention directly via presence of meaning in life, and indirectly via moral elevation and presence of meaning in life.

CONCLUSIONS

The findings add knowledge of how mindfulness may increase COVID-19 vaccination intention, and underscore the potential need for mindfulness training, positive emotion promotion, presence of meaning in life interventions to improve acceptance of COVID-19 vaccination among health care workers.

Predicting COVID-19 Transmission to Inform the Management of Mass Events: Model-Based Approach

BACKGROUND

Modelling COVID-19 transmission at live events and public gatherings is essential to controlling the probability of subsequent outbreaks and communicating to participants their personalized risk. Yet, despite the fast-growing body of literature on COVID-19 transmission dynamics, current risk models either neglect contextual information including vaccination rates or disease prevalence or do not attempt to quantitatively model transmission.

OBJECTIVE

This paper attempted to bridge this gap by providing informative risk metrics for live public events, along with a measure of their uncertainty.

METHODS

Building upon existing models, our approach ties together 3 main components: (1) reliable modelling of the number of infectious cases at the time of the event, (2) evaluation of the efficiency of pre-event screening, and (3) modelling of the event's transmission dynamics and their uncertainty using Monte Carlo simulations.

RESULTS

We illustrated the application of our pipeline for a concert at the Royal Albert Hall and highlighted the risk's dependency on factors such as prevalence, mask wearing, and event duration. We demonstrate how this event held on 3 different dates (August 20, 2020; January 20, 2021; and March 20, 2021) would likely lead to transmission events that are similar to community transmission rates (0.06 vs 0.07, 2.38 vs 2.39, and 0.67 vs 0.60, respectively). However, differences between event and background transmissions substantially widened in the upper tails of the distribution of the number of infections (as denoted by their respective 99th quantiles: 1 vs 1, 19 vs 8, and 6 vs 3, respectively, for our 3 dates), further demonstrating that sole reliance on vaccination and antigen testing to gain entry would likely significantly underestimate the tail risk of the event.

CONCLUSIONS

Despite the unknowns surrounding COVID-19 transmission, our estimation pipeline opens the discussion on contextualized risk assessment by combining the best tools at hand to assess the order of magnitude of the risk. Our model can be applied to any future event and is presented in a user-friendly RShiny interface. Finally, we discussed our model's limitations as well as avenues for model evaluation and improvement.

The burden of SARS-CoV-2 among healthcare workers across 16 hospitals of Kashmir, India-A seroepidemiological study

SARS-CoV-2 pandemic has greatly affected healthcare workers because of the high risk of getting infected. The present cross-sectional study measured SARS-CoV-2 antibody in healthcare workers of Kashmir, India.

METHODS

Serological testing to detect antibodies against nucleocapsid protein of SARS-CoV-2 was performed in 2003 healthcare workers who voluntarily participated in the study.

RESULTS

We report relatively high seropositivity of 26.8% (95% CI 24.8-28.8) for SARS-CoV-2in healthcare workers, nine months after the first case was detected in Kashmir. Most of the healthcare workers (71.7%) attributed infection to the workplace environment. Among healthcare workers who neither reported any prior symptom nor were they ever tested for infection by nasopharyngeal swab test, 25.5% were seropositive.

CONCLUSION

We advocate interval testing by nasopharyngeal swab test of all healthcare workers regardless of symptoms to limit the transmission of infection within healthcare settings.