The number of AIDS cases in Europe jumped 61.9 percent between March 1989 and March 1990, with the largest percentage increases occurring in Eastern Europe, federal health officials reported.

The AIDS surge in Eastern Europe, however, is not being fueled by unsafe sexual practices or the use of drugs as in the West, but by transfusions of contaminated blood and inadequately sterilized needles in hospitals, the Centers for Disease Control said Thursday in its Morbidity and Mortality Weekly Report.The CDC said also that many of the Eastern European AIDS cases are occurring in children.