Background and objectives: Interbirth intervals (IBIs) mediate a trade-off between child number and child survival. Life history theory predicts that the evolutionarily optimal IBI differs for different individuals whose fitness is affected by how closely a mother spaces her children. The objective of the article is to clarify these conflicts and explore their implications for public health. Me...

Family members of hepatitis C virus (HCV)-infected hemodialysis patients had a high rate (8.1%) of HCV infection and were often infected by the same genotype of HCV as the renal patients. Renal patients who had a longer history of hemodialysis or more frequent arteriovenous shunt replacement posed a higher risk to their household contacts, especially to their primary-care providers at home.

The problem of chronic sino-respiratory infections which includes sinusitis, bronchitis, bronchiectasis and infective asthma is of great magnitude. Although these illnesses do not immediately endanger the life of the patient they seriously affect the health of many individuals. I t is estimated that approximately 2,000,000 people in this country suffer from chronic bronchitis and 1,250,000 from...

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