期刊
THEORETICAL BIOLOGY AND MEDICAL MODELLING
卷 10, 期 -, 页码 -出版社
BMC
DOI: 10.1186/1742-4682-10-30
关键词
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资金
- Japan Science and Technology Agency (JST) PRESTO program
- Japan Society for Promotion of Science (JSPS)
- Aihara Innovative Mathematical Modelling Project
- JSPS through the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program)
- Council for Science and Technology Policy (CSTP)
- Grants-in-Aid for Scientific Research [11J08060] Funding Source: KAKEN
Background: As the human infections with novel influenza A(H7N9) virus have been reported from several different provinces in China, the pandemic potential of the virus has been questioned. The presence of human-to-human transmission has not been demonstrated, but the absence of demonstration does not guarantee that there is no such transmission. Methods: A mathematical model of cluster size distribution is devised without imposing an assumption of subcriticality of the reproduction number and accounting for right censoring of new clusters. The proportion of cases with a history of bird contact is analytically derived, permitting us to fit the model to the observed data of confirmed cases. Using contact history with bird among confirmed cases (n = 129), we estimate the reproduction number of the novel influenza A( H7N9) from human to human. Results: Analysing twenty confirmed cases with known exposure, the reproduction number for human-to-human transmission was estimated at 0.28 (95% CI: 0.11, 0.45). Sensitivity analysis indicated that the reproduction number is substantially below unity. Conclusions: It is unlikely to observe an immediate pandemic of novel influenza A (H7N9) virus with human to human transmission. Continued monitoring of cases and animals would be the key to elucidate additional epidemiological characteristics of the virus.
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