* Men who spend more than three hours a day in a car or lorry are less fertile, research suggests. Other men affected included those exposed to heat as part of their work. Both groups of men were four times less likely to make their partner pregnant within three months (The Lancet, January 20, 1996).
* More evidence that HRT doesn't reduce the risk of heart disease. It was supposed to reduce the level of serum angiotensin-converting enzyme (ACE), but a new study from Paris shows that it had no beneficial effect (The Lancet, January 13, 1996).
* Hepatitis B infection in daycare centres is fairly easily transmitted because it can be carried in human saliva. Researchers from the University of Sydney, Australia, are recommending that vaccinations be given against the disease in centres where cases have been reported (The Lancet, January 13, 1996).
* Doctors have been using the wrong type of blood pressure test on pregnant women, researchers say. Obstetricians and midwives prefer the blood pressure gauge called Korotkoff phase 4. New research shows, however, that phase 5 testing is far more reliable. In one test, virtually nobody agreed on the reading from a K4 test, whereas everyone was in agreement on the K5 reading (The Lancet, January 20, 1996).