Odontoma is one of the most common odontogenic tumors in the jaws, and it is widely considered as tooth hamartomas. This article reports a rare compound odontoma with 39 denticles which was checked and diagnosed radically by CBCT, and relevant literatures are reviewed.

Coronavirus disease 2019 (COVID-19) pandemic has caused a total of 55 928 327 confirmed cases and 1 344 003 deaths as of November 19, 2020. But so far the origin of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that causes this pandemic has remained undetermined. The purpose of this study is to review the current research of SARS-CoV-2 and the existing problems therein, which may provide inspiration for further researches. Existing evidence suggested that SARS-CoV-2 may be derived from bat coronavirus 40-70 years ago. During the evolution, this virus underwent extensive variations in the process of mutations and natural selection. Different genomic regions of SARS-CoV-2 may have different selection pressures, but all of which increase the difficulty of tracing the origin of this virus. A wide variety of animals have been considered as potential hosts of SARS-CoV-2, including cats, lions, tigers, dogs and minks. SARS-CoV-2 has a chance to transmit from humans to animals and can be transmitted among animals. Current research evidence has shown that China is not the original source of SARS-CoV-2. It is still unclear how the virus spreads to human, and efforts are still need to be made to explore the origin of SARS-CoV-2, its hosts and intermediate hosts, and the mechanism of its transmission across different species of animals.
Animals ; COVID-19/transmission* ; Cats ; China ; Chiroptera/virology* ; Disease Vectors ; Dogs ; Evolution, Molecular ; Humans ; SARS-CoV-2/classification*

Objective:To investigate and analyze a suspected case of hemorrhagic fever with renal syndrome (HFRS) complicated with dengue fever (DF) in Longhua District of Shenzhen City, so as to improve the level of diagnosis and monitoring of such case.Methods:The morbidity and treatment data of this case were analyzed retrospectively, and the results of blood routine, urine routine, dengue virus and Hantavirus antibody, nucleic acid test and other laboratory tests were collected, the epidemiological analysis included the history of travel, mosquito bite and rodent contact was did.Results:This case was 25-year-old male presented with fever (maximum body temperature 39.4 ℃), chills and fatigue. On the 5th day, he developed oliguria. The clinical laboratory results showed that the platelet count decreased, the urine routine was detected, and the sediment tube type was 86.32 μl. The serum samples were tested, positive for dengue virus NS1 antigen and IgM antibody, negative for viral nucleic acid; positive for IgM antibody of Hantavirus, positive for Hantavirus nucleic acid. This case had a history of contact with mice without any protection, no obvious epidemiological history of DF, this patient might be a suspected case of HFRS with DF.Conclusions:This patient may be a suspected case of HFRS with DF. The infectious source of HFRS is suspected to be rats.