Density of day cares in relation to reported pertussis incidence in Philadelphia
Abstract Objectives Reported pertussis incidence has increased markedly in recent years. In addition to the documented increase in under-immunization and waning immunity, the increase may be related to the more frequent use of child care services by parents over the last few decades. Additionally, c...
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Veröffentlicht in: | Public health (London) 2017-05, Vol.146, p.126-133 |
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Format: | Artikel |
Sprache: | eng |
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