Age-specific seroprevalence of hepatitis a among school children in central Tunisia.

Hepatitis A virus (HAV) has different epidemiologic and clinical patterns, depending on the level of endemicity in a given geographic area. Tunisia is considered a region of high endemicity for hepatitis. Improvement of socioeconomic conditions in this country has made a determination of the seroprevalence of this disease advisable.

[Apport of serum vitamin B12 determination in the diagnosis of deficiency: about 95 cases].

Vitamin B12 belong a group of cobalamins. It's known to be an enzymatic cofactor of many metabolic reactions essentially in the synthesis of DNA. Damage of deficiency are various essentially hematologic and neurologic.