A new study shows that aspirin helps colorectal cancer but only after a decade of use, weakening hopes that low doses of the drug prevents the disease.

A 20-year study of almost 83,000 nurses shows that low doses of aspirin did not lower cancer risk significantly. High doses of aspirin - such as two or more aspirin per day - reduced colon cancer risk by a third but also were linked to dangerous bleeding, according to the study published in Wednesday's Journal of the American Medical Association.

A new study, published in The Lancet, says that giving young children in developing countries a weekly dose of the mineral, zinc, can substantially reduce their risk of illness and death.

In a study, conducted from 2000 to 2003, pneumonia caused almost 20 percent, or 2 million of 10.6 million, deaths, among children younger than 5 years worldwide. Diarrhea causes a further 1.9 million deaths annually to those at-risk children.

A 62-year-old woman is infected with the pig disease, streptococcus suis bacteria, bringing the total number of victims in the Hong Kong territory to 11.

Despite recent outbreaks, Hong-Kong government officials have decided to resume pork imports from Sichuan province, which has been hardest hit by the recent epidemic.

Doctors discover a new test that detects iron deficiency in infants earlier and more accurately than the commonly used hemoglobin screening test.

The results of the study released Tuesday in the Journal of the American Medical Association

Dr. Roger P. Levin, CEO of dental consulting firm Levin Group Inc., is named Chair of the Board of Visitors at the Dr. Samuel D. Harris National Museum of Dentistry by the National Museum of Dentistry. Levin is the third to hold the position following Dr. John Patterson.He says his immediate plans as Chair of the BOV include the development of a Baltimore-Washington foundation designed to enhance dental care andhygiene education for underprivileged school children. Levin holds 20-years of dental consulting experience and is the 2004 Ernst & YoungEntrepreneur of the Year Award winner in the category of consulting.Executive Director of the NMD Rosemary Fetter says, "Dr. Levin has beena significant supporter of the Museum since its inception. As Chair of theBoard of Visitors, Dr. Levin will surely continue his tremendous work withthe Museum that he has demonstrated as Membership Chair since 2002. We are very excited to have him on board."

Levin says, "I believe we all share in the obligation to give back to the community and to the field of dentistry. Now, I embark on a mission to improve the level of national awareness and much deserved respect to theMuseum for its wonderful efforts in dentistry."