ISRCTN14204141 .

Bordetella pertussis infection may cause severe illness in newborns. Mothers with B. pertussis infection during delivery can infect newborns. The seroprevalence of B. pertussis infection in pregnancy was measured in pregnant women by detection of immunoglobulin G against pertussis toxin; 6.3% had serological evidence of infection. Maternal vaccination should be considered to prevent pertussis in newborns.

Summary a-thalassaemia is a common inherited haemoglobin disorder that can cause only mild symptoms in carriers and is often either not diagnosed or mistaken for iron deficiency anaemia in the Netherlands. Although considered rare in North-Europeans, we also regularly observe common and rare defects in this population. It is important to be alert for the mild symptoms of these carriers because compound heterozygous and homozygous combinations can result in intermediate, severe or fatal disease in the progeny of healthy carriers. Using a new technical application, a novel a°-thalassaemia deletion was recently detected in our laboratories in a propositus of a large Dutch Caucasian family. We report the phenotypic and molecular study of this new form of a°-thalassaemia (called --OH a-thalassaemia deletion), which was observed in 10 of the 19 individuals studied in the index family. Our results indicate that the frequency of these unsuspected a°-thalassaemia defects is probably underestimated in the Netherlands.