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BEIJING, July 26 (Xinhuanet) -- The breast cancer is more deadly to black women than to whites, a new study found.This finding was published online Monday on the "Journal of Clinical Oncology" in the United States.The study was done by the City of Hope, a Comprehensive Cancer Center in Duarte, California.The researchers collected data from more than 4,500 U.S. women in the 35-64 age group who were diagnosed with breast cancer.With the passing of  more than eight years, the researchers found the black women have a three times death rate than white women, after taking obesity and other diseases into account."It’s been long known that breast cancer in African-American women is a far less common disease than in white women. But when it occurs, it seems to be more aggressive and harder to treat," said Dr. Lisa Carey of the University of North Carolina’s Lineberger Comprehensive Cancer Center.But why the situations varied by race, scientists are still exploring the answer.

BERLIN, July 26 (Xinhua) -- German national disease control center said on Tuesday that the country's deadly E. coli outbreak has been over, as no new case reported in the last three weeks.The Robert Koch Institute (RKI) said the last case related to the E.coli outbreak was reported on July 4.As a three-week-period would cover the disease's incubation time, diagnosis time and the time for the transfer of a case, this virtually means an end of the outbreak."The largest EHEC outbreak is over in Germany," said RKI President Reinhard Burger. "I pay tribute to people who have joined in the great work, making investigation and looking after the patients."The RKI said Germany would keep watching the deadly EHEC O104: H4 intensively and asked people to pay attention to personal and food hygiene, as individual infection still cannot be ruled out.This round of outbreak has claimed 52 lives and affected more than 4,000 people since early May.The source of this disease was first believed to be cucumbers and tomatoes from Spain, and then was locked onto bean sprouts grown in a farm near Hamburg in the state Lower Saxony. Later European authorities said one batch of fenugreek seeds from Egypt was probably the source.

WASHINGTON, July 26 (Xinhua) -- The District of Columbia Department of Health (DOH) in the U.S. announced Tuesday that it has positively identified the West Nile Virus in mosquito samples in the District.This is the first time this summer the West Nile Virus has been identified in the U.S. capital."Residents should take caution as mosquitoes have the potential to transmit West Nile Virus to humans, and it is important for residents to take the necessary steps to avoid contracting the virus," DOH said in a statement.West Nile Virus is mainly an infection of birds, but on occasions an infected mosquito may spread it to humans. The virus is not transmitted directly from birds to humans and the risk of infection is low. In human infections, the virus generally causes no symptoms, or may cause mild flu-like symptoms.Senior citizens and people with weak immune systems are considered high risk for suffering the worst from the disease, officials said."People with a higher risk of infection should wear long- sleeved shirts, long pants, and apply insect repellent with DEET or other mosquito repellents to exposed skin according to manufacturer's directions. For children, they should use a product with DEET concentration of less than 30 percent," DOH said.

BEIJING, Aug. 12 (Xinhuanet) -- The risk of developing coronary heart disease is 25 percent higher for women smokers compared with men, according to a study published in the British medical journal "The Lancet".The authors say this could be due to the physiological differences between the sexes with cigarette smoke toxins having a more potent effect on women.The study by Dr Rachel R Huxley from the University of Minnesota and Dr Mark Woodward from Johns Hopkins University involved a meta-analysis of around four million individuals and 67,000 coronary heart disease events from 86 studies.The researchers found that the pooled adjusted female-to-male relative risk ratio (RRR) of smoking compared with not smoking for coronary heart disease (CHD) was 1.25 (25 percent) higher for women.This RRR increased by 2 percent for every additional year of follow-up, meaning that the longer a woman smokes, the higher her risk of developing CHD becomes compared with a man who has smoked the same length of time.The authors say, "The finding lends support to the idea of a pathophysiological basis for the sex difference. For example, women might extract a greater quantity of carcinogens and other toxic agents from the same number of cigarettes than men. This occurrence could explain why women who smoke have double the risk of lung cancer compared with their male counterparts."Worldwide, there are 1.1 billion smokers, of whom a fifth are women.According to the Tobacco Atlas, India, with around a crore female smokers, ranks third in the top 20 female smoking populations across the globe, only the U.S. with 2.3 crore female smokers and China with 1.3 crore female smokers, are worse off.

OTTAWA, Sept. 29 (Xinhua) -- Climate change could cost Canada billions of dollars a year by the end of this decade, a government funded study group announced Thursday.The National Round Table on the Environment and the Economy said the cost of climate change for Canada could start at roughly 5 billion Canadian dollars per year in 2020 and increase to between 21 billion and 43 billion per year by 2050. Those costs would come from shoreline damage, public health problems, and disruptions to the economy.It also predicted a slight increase in deaths in major cities from heat and air pollution.The round table researchers estimated the cost of climate change is expected to be roughly 0.8 percent to 1.0 percent of GDP -- or 43 billion Canadian dollars a year -- by 2050, if the problem is allowed to worsen.But the report did not address possible benefits, such as reduced demand for hea

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