Subjects: HISTORY of immunology; HERD immunity; MICROBIAL virulence
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Subjects: HERD immunity; WAR; SOCIAL theory
Subjects: HERD immunity; PUBLIC health
Subjects: CHOLERA; VIBRIO cholerae; HERD immunityHAITI
Subjects: VACCINATION; IMMUNIZATION; HERD immunityUNITED Kingdom
Subjects: MEASLES; PUNCTUALITY; BASIC reproduction numberHONG Kong (China)
Subjects: COVID-19; COVID-19 treatment; HERD immunityMASSACHUSETTS
Subjects: PREVENTION of epidemics; HERD immunity; VACCINES
Subjects: VACCINATION; COVID-19; FOCUS groupsSPAIN
Subjects: SWINE influenza; INFLUENZA A virus; AGE groupsBELGIUM