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Coronavirus host cell receptor with antibodies, illustration. Molecular model of the angiotensin II type 2 receptor in a host cell membrane (lower centre) binding to antibodies (blue). This type of receptor is the entry point for the Covid-19 coronavirus. Antibodies are part of the immune system and help to fight disease. This receptor is a potential target for vaccines or therapies that block the receptor and make it harder for coronavirus to enter cells. Covid-19, which emerged in Wuhan, China, in December 2019, is a mild respiratory illness that can develop into pneumonia and be fatal in some cases. It is caused by the SARS-CoV-2 (previously 2019-nCoV) coronavirus. As of March 2020, the virus has spread to many countries worldwide and has been declared a pandemic. Over 100,000 have been infected with several thousand deaths. (KEYSTONE/SCIENCE PHOTO LIBRARY/RAMON ANDRADE 3DCIENCIA/SCIENCE PHOTO LIBRARY)