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Dozens of captive animal species have been found infected or proven able to be experimentally infected with SARS-CoV-2, the virus that causes COVID-19. The virus has also been found in over a dozen wild animal species. Most animal species that can get the virus have not been proven to be able to spread it back to humans.
COVID-19 is more infectious than influenza, but less so than measles. [34] Estimates of the number of people infected by one person with COVID-19—the basic reproduction number (R 0)—have varied. In November 2020, a systematic review estimated R 0 of the original Wuhan strain to be approximately 2.87 (95% CI, 2.39 – 3.44). [90]
A colorectal polyp is a polyp (fleshy growth) occurring on the lining of the colon or rectum. [1] Untreated colorectal polyps can develop into colorectal cancer. [2] Colorectal polyps are often classified by their behaviour (i.e. benign vs. malignant) or cause (e.g. as a consequence of inflammatory bowel disease).
The colorectal adenoma is a benign glandular tumor of the colon and the rectum. It is a precursor lesion of the colorectal adenocarcinoma ( colon cancer ). [ 1 ] [ 2 ] [ 3 ] They often manifest as colorectal polyps .
Coronavirus diseases are caused by viruses in the coronavirus subfamily, a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, the group of viruses cause respiratory tract infections that can range from mild to lethal.
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Affected individuals have an increased risk of colorectal cancer, precancerous colon polyps and an increased risk of several additional cancers. About 1–2 percent of the population possess a mutated copy of the MUTYH gene, and less than 1 percent of people have the MUTYH-associated polyposis syndrome.
The first documented COVID-19 infection was in a worker at a seafood stall in the Huanan market. [78] Sequences from that patient have not been published; however, SARS-CoV-2 belonging to lineage B/L were detected in environmental samples from the patient's stall. [ 78 ]