evidence: People who have pre-existing health problems are at higher risk when they have COVID-19; they should seek medical help early if worried about their condition. These include, but are not limited to: those taking immunosuppressive medication; those with chronic heart, lung, liver or rheumatological problems; those with HIV, diabetes, cancer or dementia. [...] People aged 60 years and over, and those with underlying medical problems like high blood pressure, diabetes, other chronic health problems (for example those affecting the heart, lungs, kidneys, and brain), low immune function / immunosuppression (including HIV), obesity, cancer, and unvaccinated people are most at risk of severe illness. [...] Anyone with symptoms such as acute onset of fever and cough should be tested, wherever possible, to ensure that they receive appropriate clinical care. People who do not have symptoms but have had close contact with someone who is, or may be, infected may also consider testing. Contact your local health guidelines and follow their guidance.