RESUMEN
Objective:To analyze a family clustering of coronavirus disease 2019 （COVID-19） associated with the exposure to an asymptomatic case， and to provide evidences of developing strategies for COVID-19 prevention. Methods:Epidemiological investigation was conducted on a COVID-19 family cluster （1 confirmed case and 2 asymptomatic cases）. The specimens of the cases were tested for 2019 novel coronavirus nucleic acid with real-time fluorescence quantitative polymerase chain reaction. Results:The clustering epidemic occurred in a family. Two asymptomatic cases B and C （B’s son） had Wuhan residential history. After arrival in Beijing on January 24， 2020， B stayed in his mother's house. One family member A （B’s mother） developed the disease on February 7， 2020， while the other two family members D and E （B’s wife and brother） did not develop the disease， and they were managed as close contacts. Conclusion:Thisfamily COVID-19 clustering is induced by the exposure to an asymptomatic case. Identification of asymptomatic cases is very important for the control of COVID-19 epidemic.
RESUMEN
Fecal Tibetan medicines have a long history of application in China, with a good clinical efficacy. In order to promote the development and modernization of these medicines, we consulted ancient and modern Tibetan medicine literatures to collect and summarize the names, original species, natures, flavor, functions and processing methods of fecal Tibetan medicines. A total of 35 fecal Tibetan medicines were collected, such as Jiufen, Heibingpian, Langfen, Mafen, Goufen, Gezifen. The most commonly used medicines were Jiufen and Heibingpian. Both were mainly used for the treatment of indigestion, food abdominal distension, gastric ulcer, and other gastrointestinal diseases. At present, there are only a few studies on the active ingredients, pharmacodynamics and mechanism of action of these medicines. Therefore, further study shall be conducted. The regulation of gut microbiota may be a new way to evaluate the effectiveness of fecal Tibetan medicines and their mechanism of action.