Molecular epidemiology of SARS-CoV-2 clusters caused by asymptomatic cases in Anhui Province, China.

BACKGROUND: COVID-19 is a newly emerging disease caused by a novel coronavirus (SARS-CoV-2), which spread globally in early 2020. Asymptomatic carriers of the virus contribute to the propagation of this disease, and the existence of asymptomatic infection has caused widespread fear and concern in the control of this pandemic. METHODS: In this study, we investigated the origin and transmission route of SARS-CoV-2 in Anhui's two clusters, analyzed the role and infectiousness of asymptomatic patients in disease transmission, and characterized the complete spike gene sequences in the Anhui strains. RESULTS: We conducted an epidemiological investigation of two clusters caused by asymptomatic infections sequenced the spike gene of viruses isolated from 12 patients. All cases of the two clusters we investigated had clear contact histories, both from Wuhan, Hubei province. The viruses isolated from two outbreaks in Anhui were found to show a genetically close link to the virus from Wuhan. In addition, new single nucleotide variations were discovered in the spike gene. CONCLUSIONS: Both clusters may have resulted from close contact and droplet-spreading and asymptomatic infections were identified as the initial cause. We also analyzed the infectiousness of asymptomatic cases and the challenges to the current epidemic to provided information for the development of control strategies.

Interactive Mobile Doctor (iMD) to Promote Patient-Provider Discussion on Tobacco Use among Asian American Patients in Primary Care: A Pilot Study.

INTRODUCTION: This study examined the feasibility, acceptability, and efficacy of an interactive "Mobile Doctor" intervention (iMD) for Korean and Vietnamese American men, population groups with high smoking prevalence rates. METHODS: The iMD delivers 5As (Ask, Advise, Assess, Assist, and Arrange) via tailored in-language video messages on a mobile tablet to Korean and Vietnamese male daily smokers right before a health care visit. A single-group trial was conducted with Korean- and Vietnamese-speaking patients at a federally qualified health center. Outcomes were assessed by self-reported surveys obtained postvisit and 3-month follow-up, and by examining electronic health record (EHR) progress notes from 3 consecutive primary care visits to evaluate impacts. RESULTS: Among 47 male daily smokers (87% participation rate), 98% were limited English proficient and 53% had no intent to quit smoking within 6 months. On average, iMD took 12.9 minutes to complete. All participants reported discussing smoking with their providers during the visit, and more than 90% thought iMD was at least somewhat helpful in their decision about quitting and in communicating with their providers. EHR-documented 5As were significantly higher at the iMD visit for Assess (38.3%), Assist (59.6%), and Arrange (36.2%) compared with other visits without iMD. At 3 months, 51% made at least 1 24-hour quit attempt since the intervention. The self-reported 7-day point prevalence abstinence was 19%. CONCLUSIONS: iMD is feasible and acceptable to Korean and Vietnamese male smokers, including those who were not intending to quit smoking. It is a promising tool for increasing patient-provider discussion of tobacco use and possibly smoking cessation among Asian American male smokers.