The occurrence of the disease in India, reported on 18 February, is part of a recent pattern of rapid geographical spread of the virus in wild and domestic birds.

2月18日报告的在印度发生的疾病是最近病毒在野生鸟类和家禽中迅速地理传播的一部分。

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Understanding this pattern formation mechanism will be essential to the ultimate use of stem cells in medical research and disease treatment, the scientists said.

科学家说，理解这个结构形成机制是最终在医学研究和疾病治疗中利用干细胞的基础。

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Methods We retrospectively analyzed the incidence of heart failure, treatment results, pattern of termination, and time of termination in 356 cases of pregnancy with heart disease.

方法：回顾性分析356例妊娠期心脏病患者的发病情况，心衰的发生率、治疗效果，分娩方式与时机等资料。

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Other illnesses including heart disease, Alzheimer's disease and hormonal problems can also disturb the normal pattern of sleep.

BBC: High sleeping pill use 'worrying'

However, Simon Cousens, an epidemiologist at the London School of Hygiene and Tropical Medicine, points out that such a pattern does not necessarily mean a disease outbreak is levelling off.

ECONOMIST: The BSE Inquiry

For instance, in the past several years, scientists have come to understand that a particular gene signature--a pattern of genes that are turned on and off--can be a powerful contributor to the disease Lupus, which causes swollen joints, fevers and rashes.

FORBES: Genentech's Next Act