Coronavirus Disease-2019 (COVID-19) and the Liver

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Within a year of its emergence, coronavirus disease-2019 (COVID-19) has evolved into a pandemic. What has emerged during the past 1 year is that, apart from its potentially fatal respiratory presentation from which the severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) derives its name, it presents with a myriad of gastrointestinal (GI) and liver manifestations. Expression of the angiotensin-converting enzyme-2 (ACE-2) receptor throughout the GI tract and liver, which is the receptor for the SARS-CoV-2, may be responsible for the GI and liver manifestations. Be-sides acting directly via the ACE-2 receptor, the virus trig-gers a potent immune response, which might have a role in pathogenesis. The virus leads to derangement in liver function tests in close to 50% of the patients. The impact of these derangements in patients with a normal underly-ing liver seems to be innocuous. Severe clinical presenta-tions include acute decompensation and acute-on-chronic liver failure in a patient with chronic liver disease, leading to high mortality. Evolving data suggests that, contrary to intuition, liver transplant recipients and patients with auto-immune liver disease on immunosuppression do not have increased mortality. The exact mechanism underlying why immunosuppressed patients fare well as compared to other patients remains to be deciphered. With newer variants of COVID-19, which can spread faster than the original strain, the data on hepatic manifestations needs to be updated to keep a step ahead of the virus.
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