The Perspective of Coronavirus Disease Outbreak: Epidemiology, Transmission, and Possible Treatment

Developing an Effective Peptide-Based Vaccine for COVID-19: Preliminary Studies in Mice Models

Coronavirus disease 2019 (COVID-19) has caused massive health and economic disasters worldwide. Although several vaccines have effectively slowed the spread of the virus, their long-term protection and effectiveness against viral variants are still uncertain. To address these potential shortcomings, this study proposes a peptide-based vaccine to prevent COVID-19. A total of 15 B cell epitopes of the wild-type severe acute respiratory coronavirus 2 (SARS-CoV-2) spike (S) protein were selected, and their HLA affinities predicted in silico. Peptides were divided into two groups and tested in C57BL/6 mice with either QS21 or Al(OH)₃ as the adjuvant. Our results demonstrated that the peptide-based vaccine stimulated high and durable antibody responses in mice, with the T and B cell responses differing based on the type of adjuvant employed. Using epitope mapping, we showed that our peptide-based vaccine produced antibody patterns similar to those in COVID-19 convalescent individuals. Moreover, plasma from vaccinated mice and recovered COVID-19 humans had the same neutralizing activity when tested with a pseudo particle assay. Our data indicate that this adjuvant peptide-based vaccine can generate sustainable and effective B and T cell responses. Thus, we believe that our peptide-based vaccine can be a safe and effective vaccine against COVID-19, particularly because of the flexibility of including new peptides to prevent emerging SARS-CoV-2 variants and avoiding unwanted autoimmune responses.

The emergence of severe acute respiratory syndrome-coronavirus 2 epidemic and pandemic

In the history of travel and tourism, a microscopic creature wrote a dark note, which interrupted the fast pace of globalization. In December 2019, in the seafood market of Wuhan city of China, a severe viral pneumonia-like infection was initiated, and which was new to the world and resulted in the emergence of a global health emergency. Thousands of passengers traveled through the city without knowing that one travel can change not only their lives but the future of the world. When WHO declared the severe acute respiratory syndrome-coronavirus 2 (SARS-CoV-2) outbreak as a global emergency, still no one thought of the conversion of the epidemic in the worst pandemic of the ongoing decade. Initially, the spread of SARS-CoV-2 infection over a wide area with a lot of patients at the same time declared it as a global epidemic, but the rapid escalation of the infection at more comprehensive geographical locations with a significant portion of the infected population soon turned the epidemic into the pandemic. The imported cases soon spread to their native places and turn the disease pandemic. While many countries are imposing partial or complete lockdown for the safety of travelers and civilians, the vacant human-made spaces and tourist architectures are asking that where the lacunae were, which has put the globe in such a devastating phase. The emergence of SARS-CoV-2 created a colossal health crisis for the entire world. From a provincial health concern to a global meltdown, the impact of SARS-CoV-2 has undeniably impacted the world medically, socially, financially, and psychologically. The footprints of SARS-CoV-2 are impactfully imprinted on the decade that will require a lot of time for global recovery.

Acute effect of the COVID-19 pandemic on emergency transportation due to acute alcoholic intoxication: a retrospective observational study

Background

The COVID-19 pandemic has caused changes in people’s drinking habits and the emergency management system for various diseases. However, no studies have investigated the pandemic’s impact on emergency transportation for acute alcoholic intoxication. This study examines the effect of the pandemic on emergency transportation due to acute alcoholic intoxication in Kochi Prefecture, Japan, a region with high alcohol consumption.

Methods

A retrospective observational study was conducted using data of 180,747 patients from the Kochi-Iryo-Net database, Kochi Prefecture’s emergency medical and wide-area disaster information system. Chi-squared tests and multiple logistic regression analyses were performed. The association between emergency transportation and alcoholic intoxication was examined. The differences between the number of transportations during the voluntary isolation period in Japan (March and April 2020) and the same period for 2016–2019 were measured.

Results

In 2020, emergency transportations due to acute alcoholic intoxication declined by 0.2%, compared with previous years. Emergency transportation due to acute alcoholic intoxication decreased significantly between March and April 2020, compared with the same period in 2016–2019, even after adjusting for confounding factors (adjusted odds ratio 0.67; 95% confidence interval 0.47–0.96).

Conclusions

This study showed that lifestyle changes due to the COVID-19 pandemic affected the number of emergency transportations; in particular, those due to acute alcoholic intoxication decreased significantly.

Soaring Asymptomatic Infected Individuals Bring About Barriers and Difficulties for Interruption of COVID-19 Prevalence in China

Background: Coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has become a global pandemic, which has caused unprecedented damage to human health and life. The present study aimed to carry out and discover asymptomatic infected individuals in Shenzhen, China. The data will provide the control measures to stop COVID-19 prevalence. Methods: The study was a retrospective review of medical records from 462 confirmed patients with COVID-19 and 45 asymptomatic infected individuals in Shenzhen from January 19 to April 30, 2020; this is a retrospective, observational multicenter study. Results: A total of 462 confirmed cases were diagnosed in Shenzhen from January 19 to April 30, 2020. The cohort included 423 domestic cases (91.56%, 95% confidence interval [CI]: 88.67-93.76) and 39 (8.44%, 95% CI: 6.24-11.33) imported cases from other countries. Moreover, a total of 45 asymptomatic infections were found, encompassing 31 (68.89%, 95% CI: 54.34-80.47) local infections and 14 (31.11%, 95% CI: 19.53-45.66) individuals imported from other countries. The proportion of asymptomatic infected persons in Shenzhen is continuously increasing (Z = 13.19, p < 0.0001). The total number of local asymptomatic infections was more than that in other provinces (χ² = 118.83, p < 0.0001). The proportion of asymptomatic infected individuals among cases imported from other countries was higher than the domestic cases (χ² = 22.51, p < 0.0001, odds ratio = 4.90, 95% CI: 2.40-9.98). Conclusions: The proportion of asymptomatic infection is increasing. Hence, development and application of the diagnosis method with high sensitivity and specificity play a critical role in reducing COVID-19 global epidemics.