# Global respiratory virus vaccine recommendations > Live situation record from CLSTR: https://clstr.news/situations/global-respiratory-virus-vaccine-recommendations > Updated: 2026-09-27T09:01:41.000Z. Sources: 8. Developments: 2. Public health organizations have issued updated guidance regarding respiratory virus immunizations for upcoming seasons. In early September 2026, the California Department of Public Health and the West Coast Health Alliance released recommendations for the 2026-2027 season. These guidelines focus on COVID-19, influenza, and respiratory syncytial virus (RSV) to mitigate healthcare system strain, specifically targeting healthcare workers, pregnant individuals, and the youngest and oldest populations. By late September 2026, the World Health Organization announced the recommended influenza vaccine composition for the 2027 season in the southern hemisphere. Based on data from the Global Influenza Surveillance and Response System, the WHO is moving toward a trivalent vaccine standard because the B/Yamagata lineage is no longer circulating significantly. The recommendations include specific A/H1N1, A/H3N2, and B/Victoria lineage strains to ensure vaccines match circulating viruses. ## Timeline ### 2026-09-27: WHO announces 2027 influenza vaccine composition recommendations The WHO has released the recommended trivalent influenza vaccine composition for the 2027 southern hemisphere season, targeting specific A and B virus strains to ensure optimal global protection. 4 sources. https://clstr.news/cluster/world-health-organization-announces-2027-winter-influenza-vaccine-composition ### 2026-09-05: West Coast Health Alliance issues 2026-2027 respiratory virus vaccine recommendations The California Department of Public Health and the West Coast Health Alliance have released immunization recommendations for the 2026-2027 respiratory virus season, targeting COVID-19, flu, and RSV. 4 sources. https://clstr.news/cluster/west-coast-health-alliance-issues-2026-2027-respiratory-virus-vaccine-recommendations --- Cite as: Global respiratory virus vaccine recommendations. CLSTR, https://clstr.news/situations/global-respiratory-virus-vaccine-recommendations