word

herd immunity threshold

HERD ih-MYOO-nih-tee THRESH-ohld

hɜːrd ɪˈmjuːnɪti ˈθrɛʃhoʊld

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Syllable breakdown

herdimmunitythreshold

Dictionary meaning

proportion of a population that must be immune for an infection to stop spreading; equals 1 − 1/R₀; for measles (R₀ ≈ 15) the threshold is ~93%; reached through vaccination or prior infection

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