What should you know about the coronavirus Omicron variant?

Viruses change as they replicate. A variant has a set of genetic changes that may affect how it spreads, how well tests detect it, or how the immune system recognises it. The label Omicron groups related versions of SARS-CoV-2; it is not a diagnosis made from symptoms alone. Symptoms can overlap with other respiratory infections and may include cough, fever, headache, fatigue or feeling generally unwell. A positive test identifies infection, while specialised laboratory methods may be used to identify a variant.

The practical risk for one person depends on factors such as age, pregnancy, other medical conditions and immune status, as well as the illness itself. Read the general [COVID-19](/conditions/covid-19/) guidance alongside any current local advice.

If you develop compatible symptoms or have a confirmed infection, follow local advice about testing, staying away from others while unwell and returning to normal activities. Improve airflow indoors, avoid close contact with people at higher risk, and wash your hands. Rest and take fluids; use medicines only as directed and check before taking a new product if you have another condition. Do not assume a variant label makes home care suitable for everyone.

Get urgent help for difficulty breathing, persistent chest pain, sudden confusion, inability to wake or stay awake, or blue or grey lips or skin. Contact a clinician promptly if fever is worsening, you cannot keep fluids down, or weakness is becoming pronounced. New or worsening breathlessness needs assessment because COVID-19 can affect the lungs, including through [Pneumonia](/conditions/pneumonia/). Ongoing tiredness or other symptoms after infection may need review for [Long COVID](/conditions/long-covid/).

Ask whether you need a test, how long to limit contact, and whether your health history changes your treatment options. Share the date symptoms started, test results, current medicines and any breathing change.