The standards defined follow the guidelines of the World Health Organization (WHO)
The National Health Surveillance Agency (Anvisa) approved, on Wednesday (25), the composition of the influenza vaccines that will be used in Brazil in 2024.
Changing the composition of strains (types of viruses) of flu vaccines is essential for the effectiveness of the vaccine, as the virus adapts and mutates. The World Health Organization (WHO) regularly analyzes all the most frequently circulating subtypes of the influenza virus to improve the effectiveness of immunization.
In accordance with WHO recommendations, every year Anvisa publishes the composition of the influenza vaccines that will be used the following year.
Composition
For the year 2024, trivalent vaccines produced from chicken eggs will have to use the following strains:
- Influenza A/Victoria/4897/2022 (H1N1)pdm09.
- Influenza A/Thailand/8/2022 (H3N2).
- Influenza B/Austria/1359417/2021 (lineage B/Victoria).
For non-egg vaccines, the A (H1N1) virus strain must be a virus similar to the A/Wisconsin/67/2022 (H1N1)pdm09 influenza virus, the A (H3N2) strain must be a virus similar to the influenza virus A/Massachusetts /18/2022 (H3N2), together with the B strain.
Quadrivalent vaccines, in addition to the three types of mandatory strains, must also contain a virus similar to influenza virus B/Phuket/3073/2013 (B/Yamagata lineage).
Source: Terra
Ben Stock is a lifestyle journalist and author at Gossipify. He writes about topics such as health, wellness, travel, food and home decor. He provides practical advice and inspiration to improve well-being, keeps readers up to date with latest lifestyle news and trends, known for his engaging writing style, in-depth analysis and unique perspectives.
