Top norovirus genotypes

Recently, the previously less common GII.17 genotype increased in frequency of detection. In some countries, GII.17 viruses are now more frequently detected than GII.4 viruses, which have for decades been the most common genotype detected globablly.

Detection of GII.17 and GII.4 genotypes by date

Detection of selected genotype by date

Previously in 2023, new variants of the GII.4 genotype increased in frequency of detection (including GII.4 San Francisco, GII.4 Wichita, and GII.4 Allegany). In 2024-2025, detection of these variants declined.

Distribution of GII.4 variants

GII.4 variant type detection by date

Genotype distribution (percent of total number of sequences)

Contributors

Centers for Disease Control, Atlanta, GA, USA

Jan Vinjé, Leslie Barclay, and Eddie Bartlett

CDC Foundation, Atlanta, GA, USA

Jennifer Cannon, Shane Embury, and Boris Relja

Norosurv.org Developers

Pieter Ideler, Back-end developer (Pi-dev); Thijs Van de Velde, Front-end developer; Bram Borremans, Dev-ops (Bulls-i); Jennifer Cannon, RShiny dashboard

Research Institute for Tropical Medicine, Manila, the Philippines

Joseph Bonifacio, Mary Ann Igoy, C. Eures Iyar Oasin, and Mayan Lumandas

University of Valencia, Valencia, Spain

Javier Buesa and Noemi Navarro-Lleó

Costa Rican Institute of Research and Education in Nutrition and Health (INCIENSA), La Unión, Cartago, Costa Rica

Francisco Javier Duarte Martínez, Mariel López

Rotavirus and Norovirus Regional Reference Laboratory, Oswaldo Cruz Institute, Fiocruz, Brazilian Ministry of Health, Brazil

Tulio M. Fumian

Christian Medical College, Vellore, India

Tintu Varghese and K. Maheswari

Children’s Healthcare of Atlanta, Atlanta, GA, USA

Mark D. Gonzalez

Centre for Infectious Disease Researchin Zambia, Lusaka, Zambia

Luiza Miyanda Hatyoka, Kennedy Chibesa, and Michelo Simuyandi

Institute of Environmental Science and Research, Porirua, New Zealand

Joanne Hewitt and Dawn Croucher

LabPLUS, Auckland, New Zealand

Gary McAucliffe and Terri Swager

Taiwan Centers for Disease Control, Taipei, Taiwan

Jih-Hui Lin and Shu-Chun Chiu

University of Pretoria, Pretoria, South Africa

Janet Mans

University of Antofagasta, Antofagasta, Chile

Christian Muñoz and Margarita Lay

California Department of Public Health, Richmond, California, USA

Chao-Yang Pan, Thalia Huynh, Tasha Padilla, Christine Morales, and Debra Wadford

Alberta Precision Laboratory, Edmonton, Alberta, Canada

Xiao-Li Pang and Kanti Pabbaraju

Leipzig University Hospital, Leipzig, Germany

Corinna Pietsch

International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh

Mustafiz Rahman and Mohammad Enayet Hossain

Osaka Institute of Public Health, Osaka, Japan

Naomi Sakon

Children’s Mercy Hospitals and Clinics, Kansas City, Missouri, USA

Rangaraj Selvarangan, Ferdaus Hassan, Dithi Banerjee, Chris Harrison, and Mary Moffat

Center of Excellence in Clinical Virology, Chulalongkorn University, Bangkok, Thailand

Sompong Vongpunsawad

Instituto de Investigacion Nutricional, Lima, Peru

Claudio Lanata, Ana Gil, and Alejandra Ingunza

University of New South Wales, Sydney, Australia

Peter White

Laboratorio Nacional de Salud, Guatemala City, Guatermala

Linda Mendoza

Laboratorio de Virus Gastrointestinales, Mexico City, Mexico

Fabian Gómez Santiago

Legacy contributors

Martin Chi-Wai Chan and Lin-yao Zhang, Chinese University of Hong Kong, Hong Kong, China
Filemon Bucardo, National Autonomous University of Nicaragua, León, Nicaragua
Leesa Bruggink, Peter Doherty Institute for Infection and Immunity, Melbourne, Victoria, Australia
Hannah Browne and Kenny Nguyen, CDC and CDC Foundation, Atlanta, GA, USA