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Biomedical subjects

L Muylle

Publications and source records attributed to L Muylle.

64 records · Page 4Linked to original sources
PubMedDate not supplied

Hepatitis A virus antibodies in Belgium: relationship between prevalence and age.

Epidemiological data from various countries show that the frequency of Hepatitis A virus antibodies (anti-HAV) in different population groups is largely dependent on the geographical and age distribution of the population surveyed. As regards Europe anti-HAV antibodies are generally frequent in all groups in Southern Europe while in Northern Europe these antibodies are common in older people only. The prevalence data collected in 1979 and in 1989 show that the anti-HAV antibodies rate is a function of age, but the rates for all age groups were lower in 1989 compared to 1979. In 1979, at an age between 25 and 30, some 50% of the population was anti-HAV antibody positive. The same results were obtained in another Belgian study conducted in 1979. In 1989 50% positivity was only reached at an age between 35 and 40 years. The present study confirms that anti-HAV antibody prevalence decreases with higher socioeconomic status. The higher rate relative to age is associated with socioeconomic and hygienic living conditions at the time when most infections occur, i.e. before the age of 20. It can be concluded by comparing the 1979 and 1989 results that the number of adults susceptible to HAV infections has increased. This fact drew attention in view of the strongly altered travelling pattern of fairly large sections of the population.

Adult↗
PubMedDate not supplied

Histamine levels in stored platelet concentrates. Relationship to white cell content.

The histamine levels in samples from platelet concentrates (PC) were measured at various storage times by a radioenzymatic assay. Elevated histamine levels were detected in 5 of 14 PC after 3 days of storage (range, less than 1 to 13.3 ng/ml) and in 9 of 14 PC after 5 days (range, less than 1 to 22.2 ng/ml). A very good linear correlation (r = 0.913) was found between the initial white cell content of the PC and the histamine level at 5 days of storage. The rise in histamine content was not influenced by the type of plastic container. The results indicate a process of histamine release by the white cells during storage. Although histamine is metabolized rapidly in vivo, a critical histamine threshold could be reached in man by the rapid infusion of stored PC containing high levels of histamine. This could explain some unexpected transfusion reactions in patients receiving PC.

Blood Platelets↗