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Instituto Gulbenkian de Ciencia, Oeiras

Reducing pertussis transmission causes disease resurgence

Published in Pharma Investments, Ventures and Law Weekly, April 2nd, 2006

Pertussis resurgence may be induced by a reduction in transmission, independently of vaccination.

"Since the 1980s, the occurrence of pertussis cases in developed countries has increased and shifted towards older age groups. This resurgence follows 30 years of intense mass vaccination, and has been attributed primarily to three factors: more effective diagnosis of the disease, waning of vaccine-induced immunity, and loss of vaccine efficacy due to the emergence of new Bordetella pertussis strains. Here we develop and analyze a mathematical model to assess the plausibility of these hypotheses," investigators in Portugal report.

"We consider...

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