Geneva, 19 December 2023 -- Due to its rapidly increasing spread, WHO is classifying the variant JN.1 as a separate variant of interest (VOI) from the parent lineage BA.2.86. It was previously classified as VOI as part of BA.2.86 sublineages.

Based on the available evidence, the additional global public health risk posed by JN.1 is currently evaluated as low. Despite this, with the onset of winter in the Northern Hemisphere, JN.1 could increase the burden of respiratory infections in many countries.

Tracking SARS-CoV-2 variants

All viruses, including SARS-CoV-2, the virus that causes COVID-19, change over time. Most changes have little to no impact on the virus’s properties. However, some changes may affect the virus’s properties, such as how easily it spreads, the associated disease severity, or the performance of vaccines, therapeutic medicines, diagnostic tools, or other public health and social measures.

In June 2020, the WHO Virus Evolution Working Group was established with a specific focus on SARS-CoV-2 variants, their phenotype and their impact on countermeasures. This later became the Technical Advisory Group on SARS-CoV-2 Virus Evolution. In late 2020, the emergence of variants that posed an increased risk to global public health prompted WHO to characterize some as variants of interest (VOIs) and variants of concern (VOCs) in order to prioritize global monitoring and research, and to inform and adjust the COVID-19 response. From May 2021 onwards, WHO began assigning simple, easy-to-say labels for key variants.

Considerable progress has been made in establishing and strengthening a global system to detect signals of potential VOIs or VOCs and rapidly assess the risk posed by SARS-CoV-2 variants to public health. It remains critical that these systems are maintained, and data are shared, according to good principles and in a timely fashion, as SARS-CoV-2 continues to circulate at high levels around the world. While monitoring the circulation of SARS-CoV-2 globally, it also remains essential to monitor their spread in animal populations and chronically infected individuals, which are crucial aspects of the global strategy to reduce the occurrence of mutations that have negative public health implications. In March 2023, WHO updated its tracking system and working definitions for variants of concern, variants of interest and variants under monitoring. WHO is continuously monitoring the evidence and will update the JN.1 risk evaluation as needed.

Current vaccines continue to protect against severe disease and death from JN.1 and other circulating variants of SARS-CoV-2, the virus that causes COVID-19.

COVID-19 is not the only respiratory disease circulating. Influenza, RSV and common childhood pneumonia are on the rise.

WHO advises people to take measures to prevent infections and severe disease using all available tools. These include:

-Wear a mask when in crowded, enclosed, or poorly ventilated areas, and keep a safe distance from others, as feasible

-Improve ventilation

-Practise respiratory etiquette - covering coughs and sneezes

-Clean your hands regularly

-Stay up to date with vaccinations against COVID-19 and influenza, especially if you are at high risk for severe disease

-Stay home if you are sick

-Get tested if you have symptoms, or if you might have been exposed to someone with COVID-19 or influenza

For health workers and health facilities, WHO advises:

-Universal masking in health facilities, as well as appropriate masking, respirators and other PPE for health workers caring for suspected and confirmed COVID-19 patients.

-Improve ventilation in health facilities

About WHO

The World Health Organization provides global leadership in public health within the United Nations system. Founded in 1948, WHO works with 194 Member States, across six regions and from more than 150 offices, to promote health, keep the world safe and serve the vulnerable. Our goal for 2019-2023 is to ensure that a billion more people have universal health coverage, to protect a billion more people from health emergencies, and provide a further billion people with better health and wellbeing.