herd immunity
[/hɜːrd ɪˈmjuːnɪti/]
noun
imunidade de rebanho
1. A form of indirect protection from infectious disease that occurs when a large percentage of a population has become immune to the disease, thereby providing protection for individuals who are not immune
When herd immunity reaches approximately 70-90% of the population, the spread of disease slows significantly.
Quando a imunidade de rebanho atinge aproximadamente 70-90% da população, a disseminação da doença desacelera significativamente.
2. The threshold level of immunization in a community needed to prevent sustained transmission of a contagious disease
Vaccination campaigns aim to achieve herd immunity to protect vulnerable populations.
As campanhas de vacinação visam alcançar a imunidade de rebanho para proteger populações vulneráveis.
The term became widely used in both English and Portuguese-speaking countries during the COVID-19 pandemic. In Brazil, public health agencies (ANVISA, Ministério da Saúde) frequently use 'imunidade de rebanho' in official documents and vaccination guidelines. The concept is central to public health policy discussions and vaccination campaigns in both the USA and Brazil.
Related Idioms & Phrases
reach herd immunity threshold
build herd immunity through vaccination
achieve collective protection
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